Bilateral idiopathic granulomatous mastitis

Summary

Objectives

Idiopathic granulomatous mastitis (IGM) is a benign rare inflammatory pseudotumor. Bilateral involvement of IGM has been reported in a few cases. To our knowledge, this study is the largest series of bilateral cases to date. The goals of this study were to present clinical features of bilateral IGM and to evaluate the results of treatments.

Materials and methods

We performed a retrospective review of the idiopathic granulomatous mastitis database from 2010 to 2013. Ten female patients who met required histologic and clinical criteria of IGM in both breasts were included in study. Demographic data, clinical findings, medication history, and radiologic findings are presented.

Results

The mean age at onset of the disease was 38.4 ± 8.3 years (range: 29–52 years). Nine patients had no recurrence during a mean follow-up period of 21 months (range: 11–26 months). Additionally, the median time to second breast involvement was 15.6 months.

Conclusion

Bilateral IGMs have a higher rate of more relapse and greater resistance to medical therapies than do unilateral IGMs. Surgical management should be avoided unless all medical treatment options have been exhausted. Nevertheless, expectant management seems a rational option for the treatment of bilateral IGM.

Keywords

breast cancer;cancer;corticosteroids;granulomatous mastitis;idiopathic;tuberculosis

1. Introduction

Idiopathic granulomatous mastitis (IGM), also known as idiopathic granulomatous lobulitis, is an uncommon, benign inflammatory pseudotumor that was first reported by Kessler and Wolloch in 1972¹. Clinically, IGM presents as a palpable hard lump with erythematous skin changes or lymph node involvement, which may lead to nipple discharge or retraction, sinus formation, breast atrophy, and “apple jelly” scars^{2; 3; 4; 5; 6; 7 ;  8}. IGM is usually unilateral and can be seen in all quadrant regions, except for the subareolar area^{9 ;  10}.

Few cases of bilateral involvement have been reported in the literature^{11; 12 ;  13}. To our knowledge, this study, which includes 10 bilateral IGM cases, is the largest series of bilateral cases to date. The goals of this study were to present the clinical features of bilateral IGM and to evaluate the results of treatment.

2. Materials and methods

Between 2010 and 2013, 10 female patients who met the required histologic criteria of IGM in both breasts were included in this retrospective study. The patients were referred to our mastitis study group from the Outpatient Departments of the General Surgery and Infectious Diseases Clinics. Our study group included three infectious disease physicians, two radiologists, two pathologists, and two breast surgeons. The diagnosis was confirmed by core biopsy of the suspicious breast lesions and biopsy specimens taken from the abscess wall. The pathological criteria for the diagnosis of IGM were the presence of the characteristic histopathological features of a noncaseating granulomatous inflammation centered on breast lobules, in the absence of any evidence of specific underlying causes. The presence of epithelioid histiocytes, lymphocytes, plasma cells, polymorphonuclear leukocytes, and multinucleated Langhans-type giant cells without caseous necrosis were demonstrated in each case. Treatment outcomes were evaluated by physical examination and ultrasonography (US). The clinical data in terms of the presentation, histopathology, management, recurrence, discharge from the clinic, and follow-up at monthly intervals were analyzed by a review of the medical records. The Ethics Committee of Istanbul University Cerrahpasa Medical School, Istanbul, Turkey approved the study. The document number is 83045809/604/02-15545/Date: June 5, 2014.

3. Results

3.1. Demographic data and clinical findings

Table 1 provides the clinical characteristics of the patients. The mean age at onset of the disease was 38.4 ± 8.3 years (range: 29–52 years). The patients had no history of breast carcinoma and no family history of granulomatous mastitis. All but two patients were of reproductive age, and all were parous. The parity of the patients ranged from two to five, with a mean parity of three. None of the patients had a recent history of pregnancy at the time of the presentation; the shortest and longest intervals after childbirth were 1 year and 10 years, respectively. None of the patients were breast-feeding. None of the patients had a history of tuberculosis or systemic granulomatosis, but three had a family history of tuberculosis.

Table 1. Clinical characteristics of patients with bilateral IGM.

Patients characteristics	Case 1	Case 2	Case 3	Case 4	Case 5	Case 6	Case 7	Case 8	Case 9	Case 10
Age (y)	52	51	30	33	34	40	43	32	29	40
Parity	3	4	4	2	2	4	5	2	3	3
Past lactation	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Oral contraceptive use	No	No	No	No	No	No	For 45 d 15 y ago	No	No	No
Tobacco smoking	Yes	No	Yes	Yes	Yes	Yes	No	Yes	No	No
Trauma history to the breast	No	No	No	No	No	No	No	No	No	No
Medical history	DM	Hashimotos thyroiditis	No	No	No	No	No	No	No	No
Family history in relation to TB	No	No	Yes	No	Yes	No	Yes	No	No	No
First admission to us	No	No	No	No	No	No	No	No	No	No
Presentation time	8 y after childbirth	6 y after childbirth	5 y after childbirth	2.5 y after childbirth	5 y after childbirth	1 y after childbirth	Over 2 y after childbirth	10 y after childbirth	4 y after childbirth	6 y after childbirth
Total duration of breast-feeding (mo)	36	17	60	7	Over 12 mos	48	120	12	27	60
Initial complaint	A hard mass	A hard mass and redness of the skin	A hard mass and redness of the skin	A hard mass and redness of the skin	A hard mass and redness of the skin	A painful hard mass	A hard mass and redness of the skin	A painful hard mass	A hard mass and redness of the skin	A hard mass and redness of the skin
Time from onset of symptoms to diagnosis (mo)	6	24	14	12	15	14	30	12	4	9
First affected breast side	Right	Right	Left	Right	Left	Left	Left	Right	Left	Left
Duration for the second breast involvement (mo)	6	12	12	3	15	8	48	24	4	24
Size and location of mass in right breast	2 cm, Upper inner quadrant	2.5 cm, Upper inner quadrant	3 cm, lower inner quadrant	4 cm, Upper inner quadrant	6 mm, Upper outer quadrant	1 cm, Upper outer quadrant	4 cm, Upper outer quadrant	3 cm, Upper inner quadrant	1 cm, Upper outer quadrant
Size and location of mass in left breast	2.5 cm, Upper inner quadrant	2 cm, Upper outer quadrant	3 cm upper quadrant close to aerola	4 cm, Upper outer quadrant	3 cm, Upper inner quadrant	2 cm, Upper outer quadrant	No data (left lesion 4 y ago)	3 cm, Upper inner quadrant	3 cm, Upper outer quadrant	No data(left lesion 2.5 y ago)
Core needle biopsy	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Tuberculin skin test (mm)	20	Anergic	28	9	17	8	20	8	9	Not performed
Acid fast stain	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative
Rose Bengal	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative
Radiologic tool	US	US	US	US	US	US	US	US	US	US
Abscess drainage	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Antibiotics	Amoxicillin-clavulanate	Amoxicillin-clavulanate	Ceftidoren pivoxil	Ceftriaxon + ornidazol	Amoxicillin-clavulanate	Amoxicillin-clavulanate	Fusidic acid	Amoxicillin-clavulanate	Amoxicillin-clavulanate	Ciprofloxacin + Metronidazole
Steroid therapy	No	Previously	Yes	Yes	Yes, later	Yes	No	No	Yes	No
Antituberculous therapy	No	Yes	No	No	Yes, initial	No	Previously	No	No	No
Recurrence	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Outcome	Healed	Healed	Healed	Healed	Resistant	Healed	Healed	Healed	Healed	Healed
Unsightly scars	Yes, bilateral	Yes, bilateral	Yes, bilateral	Yes, bilateral	Yes, in left breast	Yes, in left breast	Yes, in right breast	Yes, in right breast	Yes, in left breast	Yes, in left breast

DM = diabetes mellitus; IGM = idiopathic granulomatous mastitis; US = ultrasonography.

^a The data are not available due to histopathological sampling of outer clinic.

The most common presenting symptom was a hard mass, which was detected in all of the patients (n = 10; 100%). Additionally, seven presented with redness of the skin (70%), and draining sinuses (fistulas) or discharge from the breast skin (n = 7; 70%). Nine patients had no recurrence during a mean follow-up period of 21 months (range: 11–26 months). Only one patient had static disease, at a follow-up duration of 26 months ( Fig. 1).

Figure 1. The picture presents the deformation of the breast due to skin fistulas of IGM. IGM = idiopathic granulomatous mastitis.

3.2. Radiologic findings

The most useful method for evaluating the radiologic appearance of IGM is sonography. The technique defines valuable data for infectious conditions such as effusions, inflammation of parenchyma and fatty tissues, abscess formations, fistula tracts. These are the key findings for discriminating the suspected lesions from malignancy. Information of the patients' history is essential to assess before evaluation. Sonography examination showed a hypoechoic collection in nine patients (90%), solid lesion in one patient (10%), thickening of the breast skin in eight patients (80%), fistula tracts in four patients (40%), and ductal fillings and postobstructive dilatation in three patients (30%). Mammographic findings were nonspecific in the three patients who underwent mammograms. Magnetic resonance imaging (MRI) evaluation may demonstrate the extension of the disease and may be used to clarify the suspected diagnosis. MRI was performed for three cases; asymmetrical enhancement with nonspecific contrast enhancement kinetics and fluid collections were common.

3.3. Medication history

All patients (100%) had previously taken antibiotics, six patients (60%) had undergone drainage before presenting at our clinic and four patients (40%) (Cases 1, 7, 8, and 10) were treated with a second course of antibiotics (Table 1).

We sent all the biopsy samples to the histopathology department. The characteristic caseating granulomas for TB was observed only in one and this sample was sent for TB culture as well. All were stained with Periodic Acid Schiff (PAS) and Ehrlich Ziehl Neelsen (EZN) to demonstrate the microorganisms within the tissue; all remained negative.

Case 1 had two recurrences and received antibiotics and meloxicam. The patient was offered steroid treatment but refused. Following cessation of medications, the patient had expectant conservative management followed by complete spontaneous recovery. Cases 8 and 10 showed complete disease resolution and no recurrence with expectant management. Case 7 had a history of antituberculous therapy and a complete recovery of IGM in her left breast, and she was referred to us for a lump affecting the right breast. No previous pathological or microbiological data regarding tuberculosis were available. Core needle biopsy was performed, and the specimen was confirmed to be granulomatous mastitis; bacterial culture was negative. This patient was managed conservatively with regular clinical and radiological surveillance. After 2 months of follow-up, the patient showed complete recovery. One month later, she received meloxicam 15 mg once per day for 1 month to treat her pain. Until 2013, none of these four patients recurred without medication. Four (40%) patients (Cases 3, 4, 6, and 9) were treated with oral prednisolone for 6 weeks at an initial dose of 0.5 mg/kg/d in divided doses (4 + 2), which were tapered slowly with clinical improvement. Of these, Case 3 developed recurrence when the prednisolone dose was tapered. As the dose was increased, the patient seemed to respond, but the medication was stopped because she became pregnant. She underwent expectant conservative management, and experienced complete spontaneous recovery. Case 4 developed recurrence 2 months after a complete recovery following cessation of steroid therapy. Nonetheless, the recurrent disease responded well to a second course of oral prednisolone and the dose was tapered slowly. However, after a short time period, she again developed recurrence. Expectant conservative management was preferred, and the patient experienced complete spontaneous recovery after 5 months. Interestingly, this patient became pregnant during this recovery period. Case 9 showed complete recovery after a course of steroid therapy. Case 6 developed recurrence following cessation of steroid therapy, but the patient showed complete recovery after a second course. Case 2 had no clinical response to steroid treatment; however, the patient showed complete remission after undergoing combined antituberculous therapy (rifampicin, ethambutol, and isoniazid) for 6 months. Case 5 had no response to antituberculosis treatment, so she received oral prednisolone. She recurred twice following cessation of steroid therapy because of intolerance, but showed a complete response thereafter. After 2 years, she experienced a second recurrence, which is at present being treated with antibiotic therapy. There was a notable delay between onset of symptoms and diagnosis, a median of 14 months in our study. Additionally, the median time to second breast involvement was 15.6 months (Figure 2, Figure 3 ;  Figure 4).

Figure 2. Common sonographic findings of IGM (A–C). (A) The most common finding is hypoechoic collections without well defined contours; (B) skin thickening secondary to inflammation should be compared with contralateral breast; right breast skin was thickened compared with the left breast; and (C) hypoechoic fistula tracts is specific finding and should be followed due to fistula formation. IGM = idiopathic granulomatous mastitis.

Figure 3. (A,B) MRI images of bilateral IGM. (A) Contrast enhanced T1 weighted reformat substraction (2nd minute) image shows wide asymmetrical nonmass enhancement in right breast and retroareolar disease in left. (B) Corresponding color overlay T1 weighted axial scan provided by the computer-aided diagnosis (CAD) system represents nonspecific contrast enhancement kinetics in both breasts. IGM = idiopathic granulomatous mastitis; MRI = magnetic resonance imaging.

Figure 4. The picture presents the bilateral synchronous involvement in a 34-year-old woman.

4. Discussion

IGM is a rare, nonmalignant, chronic inflammatory breast condition of unknown etiology that has received little attention in the literature¹¹. Almost 200 cases have been reported during the past three decades, with most cases occurring in females from Mediterranean countries (Turkey and Jordan) and Asia (China, Arabia, and Malaysia)^{2; 3; 5; 11; 14; 15; 16; 17 ;  18}. Although no ethnic predisposition has been documented, underdiagnosis of tuberculosis mastitis might be a major reason for the increased prevalence^{19 ;  20}.

The diagnosis and treatment of IGM remains challenging. IGM can mimic breast abscess or inflammatory breast cancer in terms of physical and radiological findings. It typically presents as a unilateral palpable firm breast mass, with occasional nipple discharge, peau d'orange change, erythema, nipple inversion, breast asymmetry, draining sinuses, and scars, which are manifestations of intrinsic inflammatory or neoplastic breast disease ^{1; 2; 8; 16 ;  21}. Abscess and fistula formation, ulceration, deformity of the breast, and unsightly scars are common complications of IGM. Although this disease is not life-threatening such as other malignancies, it seriously depresses the social life of the patient ^{3; 16; 17; 21; 22; 23 ;  24}.

All of our patients had hard masses as the initial complaint, which were painful in only two patients. Six (60%) patients had redness of the skin. There was a tendency for local recurrence and delayed wound healing. All of our patients had at least one recurrence, and most experienced inadequate or no response to various treatment modalities.

IGM is seen mostly in females of childbearing age with a history of pregnancy and lactation in the previous 5–6 years^{9; 11 ;  25}. Although the youngest and oldest females ever reported were aged 11 years and 83 years, respectively, the disease usually appears in the breast in the third or fourth decade^{3; 17 ;  19}. However, younger patients were reported in recent trials^{2; 26; 27; 28; 29 ;  30}. In our study, the mean age of patients at onset of the disease was 38.4 years.

There was a notable delay between onset of symptoms and diagnosis, a median of 14 months in our study. As IGM is rare, this disease is not routinely considered as a differential diagnosis of a simple breast abscess. Surgical drainage or US-guided aspiration is commonly preferred in practice in place of core-needle biopsy or incisional biopsy from the abscess wall, which may explain the prolonged time to diagnosis. The median time to second breast involvement was 15.6 months. No response to antibiotics was observed in three of the 10 unilateral mastitis cases before the second breast was involved. Two patients showed no response to antibiotics and steroid therapy before bilateral involvement. One patient showed a partial response to antibiotics, but bilateral involvement occurred thereafter. Three patients showed a complete response (1 responded to antibiotics, 1 to antibiotics and steroids, and 1 to antibiotics and abscess drainage), but they later developed bilateral involvement. Only one patient showed complete disease resolution after antituberculosis treatment; unfortunately, the other breast showed involvement 48 months later. We concluded that bilateral IGMs were resistant to medical treatment, and tended to relapse and recur.

All of our patients had a history of pregnancy, were parous, and had breast-fed. No patient experienced symptom-onset during lactation. These results are in accordance with previous reports that pregnancy and breastfeeding conditions are associated with an increased risk of IGM^{15; 26; 31; 32; 33 ;  34}. However, Azlina et al¹⁸ and Fletcher et al³⁵ found no association with lactation. In Cases 3 and 4 in our series, the medication was stopped because the patients became pregnant. These patients had expectant conservative management, and experienced complete spontaneous recovery. It is unclear whether being pregnant or receiving expectant management therapy contributed to their recovery. Kaur et al³⁶ reported that prolonged breast-feeding might cause long-term distension of acini and ducts, causing them to rupture. They suggested that this factor might cause a granulomatous response. Baslaim et al² opposed this idea; they reported that patients, especially nursing mothers who had breast-fed from one breast only, developed the disease in the contralateral breast.

The etiology of IGM is unclear; however, many factors, such as local irritants, oral contraceptives, nicotine addiction, and breast trauma, have been considered^{2; 3; 9; 15; 16; 30; 37 ;  38}. No patients included in the studies by Ozel et al³⁰, Azlina et al¹⁸, or Neel et al³⁹ used oral contraceptive hormones. Only one of our patients used oral contraceptives for a short period 15 years ago. The patients in the study by Azlina et al¹⁸ were nonsmokers. In addition, the patients had no history of local trauma to the breast in the Ozel et al³⁰ study. In our study, six patients were smokers, but none reported a history of local trauma. An association between periductal mastitis (but not IGM) and nicotine addiction has been established, as seen in more than half of our patients (60%); moreover, smoking may delay recovery and extend IGM disease involvement to the second breast.

Although unilateral IGM is typical in previous reports, bilateral involvement has been included in only a maximum of two patients in these studies^{4; 12 ;  30}. Bilateral involvement has been reported at a lower frequency, and we found no reports of a bilateral IGM series. Some authors reported more common involvement of the right breast^{16; 19 ;  35}, whereas others reported left or equal involvement^{30 ;  39}. In our study, the left breast was the first affected in six of 10 patients.

For an accurate diagnosis, IGM must be differentiated from other disorders such as tuberculosis, sarcoidosis, foreign body reaction, ductal ectasia, mycotic infection, Wegeners granuloma, and histoplasmosis⁴⁰. Diagnostic tests for tuberculosis include the purified protein derivative (PPD) skin test, in vitro interferon-gamma assay and polymerase chain reaction. Ziehl-Neelsen (ZN) stain PPD and routine histology studies are sometimes insufficient to exclude tuberculosis mastitis ^{16; 41 ;  42}. In our study, periodic acid-Schiff (PAS) and ZN acid-fast stains failed to identify specific causative organisms in any of the 10 patients. The PPD skin test was not performed in one patient. Four patients had positive PPD skin test results (> 10 mm indurations). Case 2 was anergic for PPD, and she did not respond to steroid treatment; therefore, she commenced combined antituberculous therapy (rifampicin, ethambutol, and isoniazid) for 6 months and showed complete remission. Further differential diagnoses were negative, including a chest X-ray, the Rose Bengal test, and the antidsDNA test.

US, mammography, and MRI have limited roles in distinguishing granulomatous mastitis from malignancy. Mammographic examination may show a focal asymmetrical density in dense breast parenchyma or a mass with a recognizable margin in fatty breasts. US has been used to describe the disease as inhomogeneous hypoechogenicity with internal hypoechoic tubular lesions^{4; 10; 19; 25; 43; 44 ;  45}. It is possible to discriminate benign neoplastic lesions from cancer using dynamic contrast-enhanced MRI; however, this method has lower specificity for distinguishing granulomatous mastitis from breast cancer. Therefore, MRI may support US and mammography findings in distinguishing benign inflammatory lesions from malignant lesions^{5; 45; 46 ;  47}. MRI aids the surgical approach by delineating the extent of the disease, as edema of the breast skin and tissue prevent precise evaluation by US¹². In our study, US revealed loculated fluid collections of various sizes and ill-defined hypoechoic masses in three cases. Two patients underwent breast MRI previously in other centers. In one case, ductal carcinoma in situ was suspected based on MRI; however, US-guided biopsy proved the diagnosis to be IGM. Consequently, there are no IGM-specific radiological findings. US and mammography are used to rule out breast cancer in centers that have experienced numerous cases of IGM. Diagnosis is confirmed on tissue sampling biopsy by revealing noncaseating granuloma with epithelioid histiocytes, giant cells, plasma cells, and eosinophils confined within breast lobules ⁴⁸.

No clear consensus exists in the literature regarding the optimal treatment approach for IGM, as none seems to be ideal. Treatment options include antibiotics, steroids, methotrexate (MTX), azathioprine, drainage of the wound, wide surgical resection, mastectomy, and expectant management with close follow-up^{49; 50; 51; 52; 53 ;  54}. Aggressive surgery, such as wide resection or mastectomy, is an accepted treatment^{7; 15 ;  55}, whereas some recommend a conservative approach^{17 ;  39}. In addition to being therapeutic, surgical excision provides a definitive diagnosis⁵⁶. Involvement of oncoplastic surgery, such as mastectomy, followed by autologous breast reconstruction and steroids are alternative treatments for severe and intractable cases³³. However, surgical resection can also be associated with complications, including recurrence rates as high as 50%, poor wound healing, sinus tract or abscess formation, and disfigurement^{9; 15; 16; 17; 22; 33; 40; 57; 58 ;  59}. None of our patients with bilateral IGM underwent surgical resection.

Regarding conservative management, steroids as a primary treatment have been shown to be beneficial for shrinking the lesion both pre- and postoperatively in persisting masses^{60 ;  61}. DeHertogh et al⁶⁰ first reported that high-dose prednisone was more effective in recurrent or refractory cases. Many clinicians recommend an initial treatment of 30–60 mg prednisone orally, which is tapered gradually over several weeks (from 1 week to 22 months)^{18; 19; 22; 24; 28; 40; 41; 44; 52; 53 ;  62}. In our study, four (40%) cases were treated with oral prednisolone for 6 weeks at an initial dose of 0.5 mg/kg/d in divided doses (4 + 2), which were tapered slowly with clinical improvement. Because continued high doses of steroids until complete resolution may be necessary^{51 ;  60}, the patients should be observed closely for side effects, such as glucose intolerance and Cushings syndrome, as well as weight gain, avascular necrosis, depression, and cataracts^{13; 20 ;  63}. One should also take into account relapses following withdrawal of the therapy or tapering off the dose^{57 ;  60}. One of our patients relapsed when the steroid dose was tapered-off. Two patients developed recurrence after a complete recovery following cessation of steroid therapy. Only one of four patients who was given prednisone showed complete recovery after a course of steroid therapy, and no relapse occurred. However, no relationship was detected between the second breast involvement and the withdrawal of the steroid therapy or tapering off the dose in our patients.

As steroids exacerbate infectious disease, all suspicious infectious etiology should be excluded before commencing steroids^{33 ;  64}. If there is a likelihood of a superinfection because of the presence of inflammatory signs, antibiotics as an initial treatment may be offered until a definitive diagnosis is reached, otherwise antibiotics have no therapeutic value for true cases of IGM⁶². Our policy is to perform surgical drainage and offer antibiotics prior to starting systemic corticosteroids if the disease is complicated by abscess. Even though it was rarely investigated, immunosuppressive therapy including MTX and azathioprine has been considered an alternative option in cases of recurrence, resistance, and side effects of prednisone^{26; 53; 57 ;  65}. We did not prefer this medication for our patients.

Complicated and resistant cases might benefit from steroids after excision¹⁹. Gurleyik et al⁵⁸ recommended consecutive surgical excision of the remaining tissue after steroids and claimed that this treatment would provide better cosmesis and lower recurrence. The surgeon as well as the patient should have patience during the course of the disease because it is characterized by slow resolution and tends to gradually resolve spontaneously². Observation without any therapy, known as expectant conservative management, is an effective treatment approach⁶³; however, close follow-up is essential. If untreated, spontaneous regression in up to half of cases has been reported⁸. Thus Lai et al³ reported complete disease resolution and no recurrence in 50% of their patients with expectant management. Correlatively, six (60%) of our patients underwent expectant conservative management and showed spontaneous complete recovery, as mentioned above. In the absence of inflammatory signs in mild disease, expectant management is preferred. If the condition worsens clinically and radiologically, steroids are administered for 6–8 weeks at an initial dose of 0.5 mg/kg/d in divided doses (4 + 2), which are tapered slowly with clinical improvement. As there is a strong tendency for persistence or recurrence, surgery should be considered in untreatable cases.

For follow-up, all of the patients were invited to our mastitis study group for examination once or twice per week until the symptoms resolved. The disease course was followed by routine US at 1- and 3-month intervals. After significant wound healing, 6-month follow-up US is preferred. Finally, when the disease had resolved completely, annual examination and screening were advised.

Although the diagnosis and management of IGM remain challenging, interdisciplinary approaches to this disorder are essential. Unnecessary intervention and delays in the diagnosis and treatment can be avoided by precise radiological and pathological evaluation. In conclusion, bilateral IGMs have a higher rate of more relapse and greater resistance to medical therapies than do unilateral IGMs. Surgical management should be avoided unless all medical treatment options have been exhausted. Nevertheless, expectant management seems a rational option for the treatment of bilateral IGM. Nicotine addiction may worsen the course of the disease and lead to involvement of the second breast.

To our knowledge, this is the first review of 10 bilateral IGM cases in the literature. However, this study had limitations, including its retrospective nature and descriptive review of a limited number of cases. Although this study does not provide strong evidence of the common features of IGM, it does suggest the clinical features of bilateral IGMs.

Acknowledgments

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