Effect of topical steroid treatment on idiopathic granulomatous mastitis: clinical and radiologic evaluation

Refractory and Recurrent Idiopathic Granulomatous Mastitis Treatment: Adaptive, Randomized Clinical Trial

BACKGROUND

Idiopathic granulomatous mastitis (IGM) is mostly described as an autoimmune disease with higher prevalence among Middle Eastern childbearing-age women. This study aimed to evaluate the best treatment of choice in patients with resistant or recurrent IGM.

STUDY DESIGN

Patients with established recurrent or resistant IGM who were referred to the Breast Cancer Research Center from 2017 to 2020 were randomly assigned to either one of the following treatment groups: A (best supportive care), B (corticosteroids: prednisolone), and C (methotrexate and low-dose corticosteroids). This adaptive clinical trial evaluated radiological and clinical responses, as well as the potential side effects, on a regular basis in each group, with patients followed up for a minimum of 2 years.

RESULTS

A total of 318 participants, with a mean age of 33.52 ± 6.77 years, were divided into groups A (10 patients), B (78 patients), and C (230 patients). In group A, no therapeutic response was observed; group B exhibited a mixed response, with 14.1% experiencing complete or partial responses, 7.7% maintaining stability, and 78.2% experiencing disease progression. Accordingly, groups A and B were terminated due to inadequate response. In group C, 94.3% achieved complete response, 3% showed partial remission, and 2.7% had no response to therapy. Among the entire patient cohort, 11.6% tested positive for antinuclear antibodies, 3.5% for angiotensin-converting enzyme, and 12.3% for erythema nodosum. Notably, hypothyroidism was a prevalent condition among the patients, affecting 7.2% of the cohort. The incidence of common side effects was consistent across all groups.

CONCLUSIONS

The most effective treatment option for patients with recurrent or resistant IGM is a combination therapy involving steroids and disease-modifying antirheumatic drugs such as methotrexate.

A meta-analysis of idiopathic granulomatous mastitis treatments for remission and recurrence prevention

Purpose

The major aim of our meta-analysis was to review the effectiveness of various treatment modalities for achieving successful remission and preventing recurrence for women with idiopathic granulomatous mastitis (IGM). This knowledge is instrumental in developing evidence-based guidelines for clinicians to improve management strategies and outcomes for patients with IGM.

Methods

A systematic literature search was performed on MEDLINE (Ovid), Embase (Elsevier), PubMed, Cochrane Library, Web of Science, and Google Scholar; studies published to 19 January 2022 were included. A meta-analysis of 57 observational studies was performed. The results of two randomized controlled trials were also examined.

Results

There were 3,035 IGM patients across the observational and randomised studies. Overall recurrence and remission rates across all treatment strategies in 59 studies are 87.9% (2,667/3035) and 13.5% (359/2667), respectively. The studies reported 19 different treatment strategies, comprising observation, medical monotherapies, surgery, and combinations involving medical therapies, with and without surgery. Among monotherapy treatment, surgical management had the highest pooled remission rate (0.99 [95% confidence interval (CI) = 0.97-1.00]); among combination therapy, this was steroids and surgery (0.99 [0.94-1.00]). Antibiotic monotherapy had the lowest remission rate (0.72 [0.37-0.96]). The highest recurrence rates belonged to treatments that combined antibiotics and surgery (0.54 [0.02-1.00]), and antibiotics, steroids, and surgery (0.57 [0.00-1.00]). Most successful for preventing recurrence were observation (0.03 [0.00-0.10]), methotrexate (0.08 [0.00-0.24]), and steroids and surgery (0.05 [0.01-0.12]). There is a significant association between longer follow-up duration and recurrence rate reported, p = 0.002.

Conclusion

Combination therapies, especially those incorporating antibiotics, steroids, and surgery, have demonstrated higher remission rates, challenging the use of antibiotic monotherapy. There is an increased emphasis on the need for personalised, multi-pronged approach for preventing IGM recurrence, with longer follow-up care. More prospective future work in IGM research, with standardised diagnostic criteria, treatment protocols, and reporting guidelines will be important for developing treatment protocols and guidelines clinicians can adhere to in the clinical management of IGM patients.Systematic review registration: PROSPERO (CRD42022301386).

The Effect of Local Steroid Administration on Idiopathic Granulomatous Mastitis: A Systematic Review andMeta-Analysis

INTRODUCTION

Idiopathic granulomatous mastitis (IGM) is a rare, benign inflammatory breast disease. Corticosteroids and surgery are the primary treatment options, and a growing number of publications have shown the effectiveness of local steroid administration (intralesional injection and topical corticosteroids). However, less is known about the specific details and effects of this treatment approach. The purpose of this meta-analysis was to summarize the details and evaluate the efficacy of local steroid administration for IGM.

METHODS

The PubMed, Embase, Cochrane Library, and SinoMed databases were systematically searched from inception to July 2023 to identify relevant randomized controlled trials. The quality of the included studies was assessed, and meta-analysis and subgroup analysis were conducted to obtain the pooled effect sizes of the outcomes of interest.

RESULTS

Eight trials comprising 613 patients were included. Local steroid administration included intralesional injection and topical steroid ointment, and control groups were mainly given systemic therapy (oral steroid) and surgical treatment. The meta-analysis showed that local steroid administration had a significant effect on the response rate (risk ratio [RR] = 1.35, 95% CI = [1.14-1.59], P = 0.0004). The incidence of side effects was also lower than that of systemic treatment (RR = 0.24, 95% CI = [0.13-0.43], P＜0.0001). There was no difference in the recurrence rate (RR = 0.8, 95% CI = [1.42-1.51], P = 0.48).

CONCLUSIONS

Local steroid administration can increase the RR and decrease the incidence of side effects for IGM patients. There is no significant difference in the recurrence rate between the local steroid administration group and the control group. Further studies are needed to identify the effect in different stages and among pregnant women.

Framework and guide for intralesional steroid injections in idiopathic granulomatous mastitis

PURPOSE

Literature on how to perform intralesional steroid injections, a valuable therapy for idiopathic granulomatous mastitis (IGM), is limited. This technical note offers a detailed technical guide on intralesional steroid injections for IGM and provides a framework for long-term follow-up.

METHODS

Ultrasound characterization of IGM severity considering breadth, depth, and ancillary findings was used to guide steroid dosing and injection frequency. Clinical and sonographic breast diagrams were designed for accurate longitudinal tracking of IGM. A step-by-step guide for ultrasound-guided IGM aspirations and intralesional steroid injections was developed.

RESULTS

A detailed approach for ultrasound-guided IGM interventions with clinical and sonographic breast diagrams for longitudinal follow-up is now in practice.

CONCLUSIONS

The treatment approach described provides a framework for multidisciplinary treatment of IGM and offers insights that may contribute to the ongoing development and improvement of management strategies for this challenging disease.

Combining intralesional steroid injection with oral steroids in patients with idiopathic granulomatous mastitis

Idiopathic granulomatous mastitis (IGM) is a chronic inflammatory breast disease. Currently, there is no international standard for steroid use in IGM, particularly for intralesional steroid injections. This study aimed to determine whether patients with IGM who received oral steroids could benefit from intralesional steroid injection. We analyzed 62 patients with IGM whose main clinical presentation was mastitis masses and who received preoperative steroid therapy. Group A (n = 34) received combined steroid treatment: oral steroids (starting dose, 0.25 mg/kg/d; tapered off) and intralesional steroid injection (20 mg per session). Group B (n = 28) received oral steroids only (starting dose, 0.5 mg/kg/d; tapered off). Both groups underwent lumpectomy at the end of steroid treatment. We analyzed the preoperative treatment time, preoperative mass maximum diameter reduction rate, side effects, postoperative satisfaction, and rate of IGM recurrence. The mean age of the 62 participants was 33.6 ± 2.3 (range, 26-46) years, and all had unilateral disease. We found that oral steroids combined with intralesional steroid injection yielded better therapeutic effects than did oral steroids alone. The median maximum diameter reduction of the breast mass was 52.06% in group A and 30.00% in group B (P = .002). Moreover, the use of intralesional steroids reduced the duration of oral steroid use; the median durations of preoperative steroid therapy were 4 and 7 weeks in groups A and B, respectively (P < .001). Group A patients were more satisfied (P = .035) with the postoperative results, including postoperative appearance and function. No statistically significant between-group differences were noted regarding side effects and recurrence rates. Preoperative administration of oral steroids combined with intralesional steroid injection yielded better therapeutic effects than did oral steroids alone and may be an effective future treatment for IGM.

Steroid refractory granulomatous mastitis treated by top surgery: A case report

RATIONALE

Granulomatous mastitis (GM) is a rare inflammatory disease and the presentation mimics infectious mastitis or breast cancer. The disease usually develops at the unilateral breast in women with breast-feeding history at their child-bearing age. Systemic steroids had been proposed as the first-line treatment, the combination of surgery was also recommended for complicated disease. However, recurrence might still happen in some rare cases. Few studies have addressed the management of such difficult situations.

PATIENT CONCERNS

We report the case of a 33-year-old androgynous and nulliparous woman who initially presented left breast erythematous swelling and was treated as infectious mastitis with debridement and antibiotics.

DIAGNOSIS

After wider excision for pathology, the diagnosis of GM was confirmed.

INTERVENTIONS

Steroids combined with methotrexate were prescribed. However, the symptoms only subsided temporarily and progressed to the contralateral side within 3 months. She finally underwent double-incision mastectomy and free nipple grafting.

OUTCOMES

The surgery was completed uneventfully, and she had a satisfactory result with no more recurrence at the 6-month follow-up.

LESSON

This GM case with the refractory treatment courses brought out the importance of surgical resection and was the first case report of treating GM with top surgery in the literature. Total mastectomy facilitated a highest complete remission rate of GM and may be advantageous for selected patients, especially in cases where steroids are intolerable.

Comparison of the Efficacy of Systemic Versus Local Steroid Treatment in Idiopathic Granulomatous Mastitis: A Cohort Study

INTRODUCTION

Steroid therapy is known to be effective against granulomatous mastitis. We aimed to compare the efficacy of local versus systemic steroid administration in patients with idiopathic granulomatous mastitis.

MATERIALS AND METHODS

This prospective cohort study included 58 patients who had either local (n = 42) or systemic (n = 16) treatment due to granulomatous mastitis between 2015 and 2019. Recurrence rates were determined as per ultrasound and magnetic resonance imaging examinations and the rate of side effects was evaluated as per patient complaints and physical examinations at the end of a 2-year follow-up period.

RESULTS

Median doses of 140 mg and 3810 mg were administered to the local and systemic group, respectively. Six (14.3%) patients in the local treatment group and 13 (81.3%) in the systemic treatment group had steroid-related side effects. The local treatment group had significantly fewer side effects than the systemic treatment group (P < 0.001). The recurrence rates were similar in both groups (P > 0.05).

CONCLUSIONS

Local steroid injection was as effective as systemic steroid therapy. Compared to systemic therapy, local steroid administration can be considered as a new therapeutic protocol with a lower dose and side effect rate.

A case management model for patients with granulomatous mastitis: a prospective study

Background

Granulomatous mastitis (GM) is a chronic inflammatory mastitis disease that requires long-term treatment and has a high recurrence rate. Case management has been proven to be an effective mechanism in assisting patients with chronic illness to receive regular and targeted disease monitoring and health care service. The aim of this study was to investigate the application of a hospital-to-community model of case management for granulomatous mastitis and explore the related factors associated with its recurrence.

Methods

This was a prospective study on patients with granulomatous mastitis based on a case management model. Data on demographic, clinical and laboratory information, treatment methods, follow-up time, and recurrence were collected and analyzed. The eight-item Morisky Medication Adherence Scale (MMAS-8) was used to investigate patients' adherence to medications. Logistic regression models were built for analysis of risk factors for the recurrence of granulomatous mastitis.

Results

By October 2021, a total of 152 female patients with a mean age of 32 years had undergone the entire case management process. The mean total course of case management was 24.54 (range 15–45) months. Almost all the patients received medication treatment, except for one pregnant patient who received observation therapy, and approximately 53.9% of the patients received medication and surgery. The overall recurrence rate was 11.2%, and “high” medication adherence (RR = 0.428, 95% CI 0.224–0.867, P = 0.015) was significantly associated with a lower rate of recurrence, while the rate of recurrence with a surgical procedure + medication was higher than that with medication alone (RR = 4.128, 95% CI 1.026–16.610, P = 0.046).

Conclusion

A case management model for patients with granulomatous mastitis was applied to effectively monitor changes in the disease and to identify factors associated with disease recurrence. “Low” medication adherence was a significant risk factor for the recurrence of granulomatous mastitis. Patients treated with medication and surgery were more likely to experience recurrence than those treated with medication alone. The optimal treatment approach should be planned for granulomatous mastitis patients, and patient medication adherence should be of concern to medical staff.

Management of granulomatous lobular mastitis: an international multidisciplinary consensus (2021 edition)

Granulomatous lobular mastitis (GLM) is a rare and chronic benign inflammatory disease of the breast. Difficulties exist in the management of GLM for many front-line surgeons and medical specialists who care for patients with inflammatory disorders of the breast. This consensus is summarized to establish evidence-based recommendations for the management of GLM. Literature was reviewed using PubMed from January 1, 1971 to July 31, 2020. Sixty-six international experienced multidisciplinary experts from 11 countries or regions were invited to review the evidence. Levels of evidence were determined using the American College of Physicians grading system, and recommendations were discussed until consensus. Experts discussed and concluded 30 recommendations on historical definitions, etiology and predisposing factors, diagnosis criteria, treatment, clinical stages, relapse and recurrence of GLM. GLM was recommended as a widely accepted definition. In addition, this consensus introduced a new clinical stages and management algorithm for GLM to provide individual treatment strategies. In conclusion, diagnosis of GLM depends on a combination of history, clinical manifestations, imaging examinations, laboratory examinations and pathology. The approach to treatment of GLM should be applied according to the different clinical stage of GLM. This evidence-based consensus would be valuable to assist front-line surgeons and medical specialists in the optimal management of GLM.

Idiopathic granulomatous mastitis: introducing a diagnostic algorithm based on 5 years of follow-up of 152 cases from Turkey and a review of the literature

PURPOSE

The goals of this study were to report our clinical experience in a single center at a high-volume tertiary university hospital in Istanbul and to introduce a diagnostic algorithm based on a 5-year follow-up of 152 women with biopsy-proven idiopathic granulomatous mastitis (IGM). IGM is an uncommon, non-malignant, chronic inflammatory disease of the mammary gland with an unknown etiology. The symptoms, clinical presentation, and radiologic findings of IGM may resemble carcinomas. To our knowledge, this study comprises the largest series of IGM, especially with a 5-year follow-up, yet reported in the English literature.

METHODS

The present study reported our single-center clinical experience at a tertiary university hospital in Istanbul, Turkey, and introduced a diagnostic algorithm using our treatment protocol based on a 5-year follow-up of 152 women with biopsy-proven IGM. Our database of 10 years' experience containing over 700 patients with IGM was evaluated. However, to assess recurrence and resistance to treatment, only the 152 patients with a long follow-up period of 5 years were included in the study group. The analysis included 152 women with biopsy-proven IGM who were treated between January 2009 and March 2014. The clinical data of the presentation, histopathology, and treatment modalities were analyzed by reviewing the medical records.

RESULTS

Of the 152 patients diagnosed with granulomatous mastitis, 32 (21%) recovered by expectant management, while 14 (9%) responded to antibiotics, 65 (43%) received corticosteroids, 20 (13%) had antituberculosis medication, 16 (11%) underwent excision, and 5 (3%) responded to non-steroidal anti-inflammatory drugs. Fifty-one patients (33%) had recurrence; of these, 30 achieved a cure with second-line treatment, 16 underwent excision, and 5 achieved a cure with observation.

CONCLUSION

IGM is a rare benign breast disorder, and clinicians need a high index of suspicion to diagnose it, as IGM can be mistaken for breast cancer. Unlike periductal mastitis, IGM does not evolve secondary to nicotine addiction and is typically seen in women of childbearing age with a recent history of pregnancy and lactation. The diagnosis can be challenging, and an evaluation with a multidisciplinary team is necessary. There is no consensus concerning the definitive treatment approach. We suggested a diagnostic algorithm in the present study, using our treatment protocol based on the 5 years' follow-up of 152 women.

Corticosteroids in idiopathic granulomatous mastitis: a systematic review and meta-analysis

Idiopathic granulomatous mastitis (IGM) is an inflammatory disease of the breasts with an unknown etiology. Corticosteroids are one the primary options for treating this disease, but the results of previous studies concerning their efficacy have been controversial. We, therefore, decided to assess the effectiveness of corticosteroids on IGM using a systematic review and meta-analysis. We conducted a systematic search using MeSH terms and all relevant keywords in PubMed, EMBASE, Cochrane Library and Web of Science until May 21, 2019. Data were analyzed using the Comprehensive Meta-Analysis (CMA) V.2 software program and presented as the event rate, risk ratio (RR) and risk difference (RD). Twelve studies including 559 IGM patients were entered into the meta-analysis. Our analysis showed that the RR and RD of recurrence in the steroid-only group compared with the surgery-only group were 2.99 (95% confidence interval [CI] 0.28-31.33) and 0.14 (95% CI - 0.01-0.30), respectively, showing no statistical significance. The meta-analysis of the steroid-only group and steroid + surgery group showed that the RR of recurrence was 6.13 (95% CI 0.41-81.62) with no significance. However, the meta-analysis of the RD showed that the risk of recurrence in the steroid group was significantly higher than that in the steroids + surgery group (RD: 0.28, 95% CI 0.11-0.44). This meta-analysis showed that managing IGM with only steroids may be less effective than the combination of steroids and surgery. This combination approach may result in a lower rate of recurrence and side effects in these patients.

Treatment Results of Intralesional Steroid Injection and Topical Steroid Administration in Pregnant Women with Idiopathic Granulomatous Mastitis

Objective

Idiopathic granulomatous mastitis (IGM) is an inflammatory and chronic benign breast disease that has proven difficult to diagnose and treat. Since most treatment modalities cannot be used in pregnant patients, the choice of treatment is more difficult and the need for surgery is more pressing. In this first and innovative study, we assess the results of local corticosteroid therapy of IGM in pregnant women.

Materials and Methods

Pregnant women with IGM were evaluated between June 2017 and May 2019. The six pregnant women were treated using intralesional steroid injections and topical steroid administration. The treatment response was evaluated, both clinically and radiologically, at the end of 2 weeks and once more at the end of 1 month.

Results

The median patient age was 26 years. The mean duration of complaints was 4.3 months. The median number of children was 2, and the mean breastfeeding time was 41 months. The predominant complaints at onset were a breast mass or local pain and inflammation in four (66.7%) patients and a breast mass with pain and without signs of local skin inflammation in two (33.3%) patients. Diagnosis was made using a tru-cut biopsy in two patients, and with an incisional biopsy in four patients who had abscess drainage and fistulation to the skin. Five (83.3%) patients achieved a complete response, and one (16.7%) patient responded only partially after the first course of treatment. A second course of treatment was given to the patient with partial response. All patients achieved complete response at the end of the second course of treatment. The mean follow-up time was 19.5 months. During the follow-up period, one patient experienced a recurrence at 4 months after giving birth, and she then received a third course of treatment. Topical and systemic side effects of the corticosteroids were not observed in any patient.

Conclusion

While the state of pregnancy generally precludes the use of most drugs, the use of local corticosteroid in the treatment of IGM is effective in terms of treatment response, treatment duration, need for surgery, and reduced recurrence and side effects.

An update on granulomatous mastitis: a rare and complex condition

Granulomatous mastitis is a rare inflammatory condition of the breast affecting women of child-bearing age. The disease is characterised by chronic and relapsing inflammation, resulting in scarring and discharging sinuses. Granulomatous mastitis is considered to be idiopathic and the pathogenesis is poorly understood. An amplified immune response has been proposed as a likely cause and there is evidence linking Corynebacterium to some cases of granulomatous mastitis. The presentation is similar to bacterial mastitis or abscess and antibiotics are commonly commenced empirically. The cornerstone of diagnosis is histopathological evaluation on core biopsy; an index of suspicion based on demographic assessment can avoid delays in diagnosis. Management is difficult and there is no consensus on best treatment. Various treatment regimens are described, with high relapse rates relating to the nature of the condition. Watchful waiting is appropriate for mild presentations and steroids are the mainstay of treatment for more severe cases. This article reviews the emerging evidence on granulomatous mastitis and describes an updated approach to management.

Idiopathic Granulomatous Mastitis: Etiology, Clinical Manifestation, Diagnosis and Treatment

Idiopathic granulomatous mastitis (IGM) is a rare form of chronic inflammatory breast disease. Although it is a benign breast lesion, it may be sometimes difficult to distinguish from breast cancer. The cause of IGM is unknown, but may be associated with autoimmunity, abnormal hormone levels and infection. While the clinical manifestations of IGM involve various manifestations of inflammation, the diagnosis is principally established by histopathology, characterized by non-caseating granulomas and microabscess formation centered on the breast lobules. Therapeutic options for IGM range from observation to various medical treatments, such as steroids, immunosuppressants, and antibiotics, to surgical intervention, particularly if secondarily infected. Given that the controversy on etiology and treatment choices, we accomplished the present review through reviewing IGM-related literature published in 'Pubmed' and 'Web of science' databases during 1997 to 2020, aiming to provide the basis for rational clinical diagnosis and treatment.

What are the new findings with regard to the mysterious disease idiopathic granulomatous mastitis?

PURPOSE

To review the demographic and clinical features and the success rates of treatment approaches for idiopathic granulomatous mastitis (IGM).

METHODS

A total of 134 patients diagnosed with IGM pathologically and treated by a single breast surgeon were retrospectively analyzed.

RESULTS

The time between the occurrence of symptoms and the last delivery was < 24 months in 25 (23.1%), 24-48 months in 51 (38.1%), and > 48 months in 52 (38.8%). The difference was statistically significant (p = 0.002). Although there was no significant difference, seasonal fluctuations were noticed, with the incidence being slightly higher during late spring and summer. Bilateral disease was present in 10 (7.5%) patients. Seven patients (5.2%) had erythema nodosum. The treatment approaches were conservative in 42, surgical procedures in 48, steroid treatment in 18, and surgical procedure + steroid treatment in 24. The median recovery time with conservative approaches was lower than that with surgical procedure + steroid treatment (p < 0.0001). Recurrence developed in 10 patients (7.7%).

CONCLUSION

Clinical differences were detected among the patients with IGM, and classification of patients by severity is needed to plan the optimal treatment approach. Seasonal fluctuations suggest the possibility of an immunological disease rather than a surgical disease.

Comparison of Topical, Systemic, and Combined Therapy with Steroids on Idiopathic Granulomatous Mastitis: A Prospective Randomized Study

BACKGROUND

Idiopathic granulomatous mastitis (IGM) is a benign disorder of the breast, for which the optimal treatment modality remains missing.

METHODS

A total of 124 patients with a histopathologically proven diagnosis of IGM were enrolled in a prospective, randomized parallel arm study. Patients were treated with topical steroids in Group T (n: 42), systemic steroids (0.8 mg/kg/day peroral) in Group S (n: 42), and combined steroids (0.4 mg/kg/day peroral + topical) in Group C (n: 40). Compliance with the therapy, response to the therapy, the duration of therapy, side effects and the recurrence rates were compared.

RESULTS

Sixteen patients did not comply with the treatment, and the highest ratio of compliance with therapy was seen in Group T (p < 0.05). Complete clinical regression (CCR) was observed in 90 (83.3%) patients. Response to the treatment (RT) was evaluated radiologically and observed in 89.8% of the patients. There was no statistically significant difference between groups regarding CCR, RT and the recurrence rate. The longest duration of therapy was observed in Group T (22 ± 9.1-week), whereas the shortest was observed in Group S (11.7 ± 5.5-week) (p < 0.001). The systemic side effects were significantly lower in Group T in comparison with Groups S and C (2.4% vs. 38.2% and 30.3%, respectively) (p < 0.001).

CONCLUSIONS

The efficiency of the treatment was similar for all groups, both clinically and radiologically. Although the duration of therapy was longer in Group T, the lack of systemic side effects increased the compliance of the patients with the therapy. Therefore, topical steroids would be among first-line treatment options of IGM.

Cystic neutrophilic granulomatous mastitis: an update

Cystic neutrophilic granulomatous mastitis (CNGM) is a rare subtype of granulomatous mastitis with a highly distinct histological pattern often associated with Corynebacterium species. CNGM is characterised by suppurative lipogranulomas that are composed of central lipid vacuoles rimmed by neutrophils and an outer cuff of epithelioid histiocytes. Some of the lipid vacuoles may contain sparse, rod-shaped, gram-positive bacilli that can be easily missed or dismissed. The surrounding mixed inflammatory infiltrate contains Langhans-type giant cells, lymphocytes and neutrophils. CNGM occurs in reproductive age women with a history of pregnancy and typically presents as a palpable mass that can be painful. CNGM has many mimickers, most significantly breast carcinoma. In many cases, CNGM has significant pathological and clinical overlap with other forms of granulomatous mastitis. Given the association with Corynebacterium species, early diagnosis of CNGM is essential in offering patients the most appropriate treatment. Prolonged antibiotic therapy specifically directed to corynebacteria is required, sometimes even beyond resolution of clinical symptoms. This comprehensive review of the existing literature on CNGM describes clinical-pathological features, microbiological findings, challenges associated with the microscopic differential diagnosis, clinical implications of this diagnosis and emerging treatment options. Morphological criteria and suggested comments to convey the degree of diagnostic certainty are also proposed for standard pathology reporting.

Different Treatments for Granulomatous Lobular Mastitis: A Systematic Review and Meta-Analysis

OBJECTIVE

Granulomatous lobular mastitis (GLM) is infrequently diagnosed. This study aimed to evaluate the efficacy and safety of managements for GLM in the nonlactation period.

METHODS

Publications were retrieved from PubMed, EMBASE, and the Cochrane library on September 10, 2018. We pooled and compared the outcome parameters and complete remission (CR) rates between different treatments using a meta-analysis.

RESULTS

Twenty-one publications including 970 patients treated with surgical excision, steroids, abscess drainage, antibiotics, and observation were included. Surgery significantly improved CR rate compared with steroids (p = 0.0003). There was no difference in the CR rate in patients treated with surgery alone or combined with steroids (p = 0.28). Surgery showed borderline significant efficacy in the CR rate compared with antibiotics (p = 0.06) and abscess drainage (p = 0.06). No difference was observed in effectiveness between observation and surgical management in patients diagnosed with early GLM and mild symptoms.

CONCLUSIONS

Although surgery was the ideal management for GLM, steroids and antibiotics might be ideal managements for GLM patients who are worried about surgical scars. Observation was an impressive alternative for patients with early GLM.

The Role of Establishing a Multidisciplinary Team for Idiopathic Granulomatous Mastitis in Improving Patient Outcomes and Spreading Awareness about Recent Disease Trends

Background

Iidiopathic granulomatous mastitis (IGM) is stereotypically described as a mysterious entity that mimics breast carcinoma imposing management challenges. In 2002, we established a multidisciplinary team to treat patients with IGM. This study aimed to evaluate the role of this team in improving patient outcomes. Also, a review of literature is provided to highlight recent disease trends. Patients and Methods. Pertinent data for 44 patients treated for IGM from 2002 to 2018 were analyzed and compared to data prior to 2002.

Results

Mean age at diagnosis was 37.9 years ± 6.4. The diagnosis of IGM was confirmed by True-cut biopsy (TCB), Frozen section (FS), and surgical biopsy in 70.5%, 25%, and 4.5% of patients, respectively. FS was used to assess the resection margins in three patients. Suspicion for malignancy was raised in one out of 39 ultrasound reports, and one out of 20 mammography reports. Wide local excision was the main treatment modality (95.5%). 19 patients (43.2%) received corticosteroids. Prior to 2002, IGM was only recognized after surgical resection with a 71% initial false impression of carcinoma. After 2002, the initial false clinical impression of carcinoma dropped to 29.5%. Recurrence rate was 31.82%. Younger age at diagnosis was significantly associated with recurrence (χ ² = 5.598; p = 0.018). Chi-square analysis showed no significant association between BMI and recurrence (χ ² = 0.776; p = 0.678).

Conclusion

The establishment of a multidisciplinary team for IGM was associated with a reduced erroneous impression of breast cancer, and a reduced false positive radiological diagnosis of breast carcinoma. FS was a useful confirmatory procedure. Our series included the first case of a diffuse papular rash as a systemic manifestation of IGM. Recent literature indicates that IGM is changing its face. IGM is being reported in all age groups, and even in males. The clinical manifestations have markedly expanded. Diagnosis by TCB has replaced blind surgical excision. More data regarding predictors of recurrence is accumulating.

Brightness Mode and Color Doppler Ultrasound in Differential Diagnosis of Breast Lesions in Saudi Females

Objective:

The aim of the study was to identify the pathological characteristics of benign and malignant breast lesions among Saudi females using brightness mode (B-mode) and color Doppler ultrasound (US).

Materials and Methods:

This study was retrospectively carried out in a single center in the Radiology and Medical Imaging Department, King Fahad Medical City, Riyadh, Saudi Arabia. A convenient method of sampling was used to include all patients referred for different diagnosis during the period of January 2016 and December 2018. A sample size of 100 cases was selected with 50% of the cases being benign breast lesions, while the rest were malignant. The data collection instruments comprised data collection sheets, while a Philips US system with a 9 MHz linear probe was used to give the differential results. The results were considered significant when P < 0.05. The statistical diagnostic test was used to detect sensitivity, specificity, and accuracy of US in the differential diagnosis of breast lesions in Saudi females.

Results:

B-mode and color Doppler US findings of breast mass measurements, shape, echotexture, and the presence and absence of vascularity present a sensitivity, specificity, and accuracy of 97.09%, 80.65%, and 93.28% in the diagnosis of benign and malignant breast masses.

Conclusion:

In Saudi females with dense breasts, the risk of breast cancer development is increased. Moreover, B-mode in combination with color Doppler US was highly determined the results of differential diagnosis for any breast lesions.

Idiopathic granulomatous mastitis: A systematic review of 3060 patients

Idiopathic granulomatous mastitis is a rare benign breast disease. A systematic review was designed. Clinical and therapeutic characteristics were analyzed. Human Development Index (HDI) was used to define two groups of study: group A (very high and high HDI) and group B (medium and low HDI). Corticosteroid therapy was done in 69% group A and 78% group B. Surgery was done in 63% in group A and 83% in group B. Antibiotics were used in 68% group A and 88% group B. There is no consensus about optimal treatment for granulomatous mastitis.

Ductal Lavage for Patients With Nonlactational Mastitis: A Single-Arm, Proof-of-Concept Trial

BACKGROUND

Surgery, steroids, and/or observations alone have been proposed for patients with nonlactational mastitis (NLM), but most of these studies were retrospective. The optimal treatment for these patients remains unclear. This prospective, single-arm, proof-of-concept trial aimed to evaluate the feasibility and safety of ductal lavage as a novel treatment for patients with NLM.

METHODS

Eligible patients with NLM received an intraductal infusion of corticosteroids and antimicrobial agents and returned the next day for a breast massage. This cycle was repeated for 2 wk, and we followed up these patients for 1 y. Patients did not receive surgery or steroids after ductal lavage. The primary endpoint was the time to complete response (CR).

RESULTS

This trial included 32 patients with a median (range) age of 32 (20-53). Skin erythema and tenderness were the major symptoms. The median (range) visual analog score was 5 (0-9). There were 21 (65.6%), 4 (12.5%), and 7 (21.9%) patients diagnosed as idiopathic granulomatous mastitis, periductal mastitis, and unspecific NLM, respectively. During the ductal lavage, the median (range) number of cannulated ducts at first attempt was 5 (3-8). Ductal lavage significantly reduced the visual analog score and mastitis score (M-score) (P < 0.01). Within a median follow-up of 15.6 mo, 93.8% (30/32) of patients achieved CR. The median (range) time to CR was 6 (0.5-21) mo. Three patients (10.0%) relapsed. No adverse events associated with ductal lavage were observed.

CONCLUSIONS

Ductal lavage for patients with NLM is feasible and safe, and a definitive randomized controlled trial for further investigation is warranted.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT02794688.

Granulomatous Mastitis: A Therapeutic and Diagnostic Challenge

Granulomatous mastitis (GM) is a rare benign inflammatory breast disease that affects mostly women of childbearing age with a history of breastfeeding. The etiopathogenesis is still unknown; however, inflammation as the result of a reaction to trauma, metabolic or hormonal processes, autoimmunity, and an infection with Corynebacterium kroppenstedtii have all been implicated. Clinical findings are pain, mass, hyperemia, and inflammation. Because the clinical presentation can mimic infectious mastitis or inflammatory carcinoma, the disease course is often protracted. The diagnosis is made by histopathology. Biopsies show a granulomatous formation in combination with a localized infiltration of multi-nucleated giant cells, epithelioid histiocytes, and plasma cells. Ultrasound, mammography, and magnetic resonance imaging are not specific; however, ultrasound and mammography should be done to exclude other pathologies. Due to the lack of data including randomized controlled studies, the management of GM is controversial. In Western industrialized countries, most authors use a therapy regimen starting with antibiotics and corticosteroids, followed by continuous steroid therapy and surgery in patients with persisting symptoms. More data are needed to define the best therapy. The role of immunotherapy has not yet been ascertained. The implementation of a registry to collect more information on this rare disease is highly recommended.

Idiopathic granulomatous mastitis: a 10-year study from a multicentre clinical database

Idiopathic granulomatous mastitis (IGM) is an uncommon, chronic inflammatory breast disease with elusive aetiology, simulating malignancy clinically and radiologically. Here we present our 10-year review on a region-wide multicentre IGM database. A retrospective study was performed on a prospectively maintained database from three University affiliated hospitals in Hong Kong and Shenzhen, China. All patients with biopsy proven IGM were included while patients with positive culture of Mycobacterium tuberculosis were excluded. Disease recurrence rate and its prognosticators were evaluated. A total of 102 patients were included between January 2007 and December 2017. Median age was 33 years (range 20-54). Most patients presented with painful inflammatory mass (n = 57); median size at presentation was 37 mm (6-92 mm). Sixty-three patients had bacterial culture performed on the pus sample: eight patients had Corynebacterium kroppenstedtii while four had Corynebacterium species not otherwise specified. Seventy-seven (75.5%) patients received conservative treatment with oral corticosteroid (±antibiotics) and drainage only, while 25 (24.5%) patients received breast lump excision after initial medical treatment. Twelve (11.8%) patients developed recurrence after a median follow-up interval of 14 months (4-51 months). Univariate analysis revealed that abscess on presentation, history of smoking, and presence of C. kroppenstedtii were significant prognosticators for recurrence. Subsequent multivariate analysis with logistic regression revealed cigarette smoking and isolation of C. kroppenstedtii as independent risk factors for disease recurrence (p < 0.05). In conclusion, IGM is uncommon with a recurrence rate of 12%, especially in patients with history of smoking and isolation of C. kroppenstedtii.

Granulomatous mastitis: etiology, imaging, pathology, treatment, and clinical findings

PURPOSE

To outline the demographics, clinical presentation, imaging features, and treatment modalities observed among a series of patients diagnosed with biopsy-proven granulomatous mastitis (GM).

METHOD

Following approval by institutional review board, retrospective chart review was performed on patients with biopsy-proven granulomatous mastitis at our institution in the period from January 2013 until October 2017.

RESULTS

A total of 90 patients were identified: 87 women and 3 men. The mean age was 35 years, mostly women in their reproductive age. In our study, patients with GM were more likely to be Hispanic compared to the general population. Sixty-three percent of patients were within 5 years of previous pregnancy. Painful palpable mass-like lesion was the most common physical finding. Breast ultrasound (US) was performed in all patients, and most commonly showed a hypoechoic irregular-shaped mass. Mammography (MG) showed asymmetry or irregular mass as the main finding. Definitive diagnosis was obtained by imaging-guided core needle biopsies in 94.4%. Conservative management was preferred, and only one patient underwent surgery.

CONCLUSION

Although clinical and radiological findings of patients with GM may mimic those of breast carcinoma, our study showed that women of childbearing age, especially among Hispanic ethnicity with a recent history of pregnancy or high prolactin level and newly tender mass-like lesion, in addition to new focal asymmetry on mammogram and heterogeneous hypoechoic irregular-shaped mass on ultrasound exam, should raise concern for GM. Non-invasive approach and clinical follow-up were the preferred treatment method.

Treatments for Idiopathic Granulomatous Mastitis: Systematic Review and Meta-Analysis

OBJECTIVES

Idiopathic granulomatous mastitis (IGM) is a benign breast disease with no ideal treatment regimen so far. This study aimed to evaluate the complete remission/resolution (CR) rate and recurrence rate of different treatment options.

METHODS

We systematically searched and identified eligible studies from January 1, 2010, to December 31, 2015, in PubMed, EMBASE, Cochrane Central Register of Controlled Trials, and Medline databases. We included original studies reporting the CR and/or recurrence rate of each treatment used. The pooled incidence and 95% confidence interval (95% CI) for CR and recurrence rate were calculated using Stata 13.0.

RESULTS

Fifteen eligible studies were included in our study. Six, nine, and five studies with 138, 358, and 106 patients were analyzed for surgical managements, oral steroids, and oral steroids+surgical managements, respectively. The pooled estimates for CR rate of them were 90.6% (95% CI 83.8%, 95.7%), 71.8% (95% CI 67.1%, 76.3%), and 94.5% (95% CI 88.9%, 98.3%). The pooled estimates for recurrence rate were 6.8% (95% CI 3.3%, 11.5%), 20.9% (95% CI 9.2%, 16.1%), and 4.0% (95% CI 1.5%, 8.4%), respectively. Other interventions analyzed were topical steroids, observation, oral steroids+MTX, and steroids+prolactin lowering agent, with varied pooled estimates for CR and recurrence rate.

CONCLUSION

Surgical managements had high CR rate with relatively low recurrence rate, with or without steroids. Thus, it was suitable for patients requiring rapid remission. However, for patients with concerns about surgical scarring, oral steroids could be an acceptable option. Further investigations are still needed to better understand the managements of IGM.

Idiopathic Granulomatous Mastitis: Overcoming this Important Clinical Challenge

The aim of this study was to determine possible risk factors for recurrence development in patients with idiopathic granulomatous mastitis (IGM). Demographic, clinical, radiologic, and histopathologic characteristics of 34 consecutive patients with IGM were retrospectively reviewed. Also, 32 patients who were informed about recurrence status were divided into non-recurrent (n = 27) and recurrent (n = 5) groups. Both groups were compared for demographic and clinical parameters. This study included 34 female patients with IGM aged between 26 and 70 years (median: 38 years). During the follow-up period, no recurrence occurred in 27 patients whereas recurrence developed in 5 patients. No significant difference was found between the groups with respect to age, lesion size, breast-feeding, number of child, marital status, use of oral contraceptive, familial or personal tuberculosis history, PPD test, smoking, lesion side, lesion location on the breast, and treatment choice. The diagnostic tools of the IGM as follows: tru-cut (n = 18); incisional (n = 6); tru-cut + incisional (n = 5); tru-cut + excisional (n = 2); tru-cut + FNAB (n = 1); FNAB + excisional (n = 1) and FNAB (n = 1). Treatment options were as follow: antibiotics + drainage (n = 10); antibiotics + drainage + corticosteroid (n = 9); wait and watch (n = 6); corticosteroid (n = 3); antibiotics + antituberculous (n = 1); antituberculous (n = 1); antibiotics + breast conserving surgery + chemotherapy (n = 1); modified radical mastectomy + chemotherapy + radiotherapy (n = 1); and no available (n = 2). This study shows that no demographic and clinical data contributes to the development of recurrence disease. To give a strong message, this study should be supported by other high volume and prospective studies.

Radiologic-Pathologic Correlation for Benign Results After MRI-Guided Breast Biopsy

OBJECTIVE

The majority of MRI-guided breast biopsies yield benign pathology. The purpose of this article is to provide a comprehensive overview of benign pathologic entities commonly encountered at MRI-guided breast biopsy.

CONCLUSION

Proper radiologic-pathologic correlation is an integral component of MRI-guided breast biopsy. Familiarity with the spectrum of MRI findings and key histopathologic features of common benign entities will enhance the radiologist's confidence in determining concordance and lead to improved patient management recommendations.

Steroids administered after vacuum-assisted biopsy in the management of idiopathic granulomatous mastitis

AIMS

The aetiology and treatment options for idiopathic granulomatous mastitis (IGM) are controversial. The aim was to study the clinical and diagnostic features and discuss medical and surgical treatment for IGM in our patients.

METHODS

Sixty-five patients who met the histological criteria for IGM were retrospectively studied. The diagnosis of IGM was confirmed using Mammotome (an ultrasound-guided, vacuum-assisted biopsy system), core needle biopsy, quadrantectomy or segmental resection. Forty-five patients were treated with prednisolone (69.2%). Immunohistochemical (IHC) staining for immune-related antigens (CD3, CD4, CD8, CD79a, IgG, and IgM) was performed.

RESULTS

Ultrasonography (USG) was carried out in all patients. Among them, 61 were considered to have an inflammatory mass and 15 had accompanying liquefaction. In four patients, the findings mimicked breast carcinoma (6.2%). The IHC results showed CD3, CD4, CD8 and CD79a lymphocytes diffusely distributed in the lesion. Stains for IgG and IgM were negative. Prednisolone was administered to the patients diagnosed with IGM. The success rate was 53 (81.5%) and the whole recurrence was 12 (18.5%). The median follow-up period was 12 months (range 4-42 months).

CONCLUSIONS

The aetiology of IGM remains uncertain. The disease has no propensity for the right or left breast. It is a local autoimmune disease, involving humoral and cell-mediated immunity. Hyperprolactinaemia may play a role in some patients. Corticosteroids administered after complete removal of the IGM lesion using the Mammotome biopsy system is an effective treatment option.

Topical Steroids Are Effective in the Treatment of Idiopathic Granulomatous Mastitis

BACKGROUND

Idiopathic granulomatous mastitis (IGM) is a rare, benign, and chronic disease of the breast. Despite the various treatment approaches described for this disease, a gold standard treatment modality has not yet been defined. In this study, the effect of topical steroids was reviewed and assessed in patients with IGM.

METHODS

The records of patients with IGM who were treated only with topical steroids were retrospectively reviewed. Patients were grouped as "completely healed," "inadequately healed," "stable," "worsened," or "recurred" if they had once healed but their symptoms returned. Patients whose skin changes were completely ameliorated were considered "completely healed."

RESULTS

All of the patients were women, and the average patient age was 35.7 years (range 24-48 years). During the average follow-up of 37.2 months (range 12-72 months) in patients who received only topical steroid treatment, recurrence was observed in three patients (3/28, 10.7 %), and no side effects or steroid-related complications occurred.

CONCLUSIONS

Topical steroids seem to be effective in the treatment of IGM characterized by skin changes. Prospective clinical studies would be useful in determining the clinical efficacy of topical steroids in the treatment of IGM.