Evaluation and Treatment of Surgical Management of Silicone Mastitis

INTRODUCTION

In 1960, the Dow Corning Corporation developed the first injectable liquid silicone that was sterile, pure, and of constant viscosity for medical application. It was marketed under the name of Dermagen and its initial purpose was for waterproofing the skin of burn patients.[1] Previously, liquid silicone was available only for industrial applications such as waterproofing, lubrication, and electrical insulation. However, since the end of World War II, prostitutes in Japan had been injecting industrial-grade silicone for the purposes of breast augmentation. In the 1960s, injection of medical-grade liquid silicone became popular in the US, although the material was never approved by the Food and Drug Administration (FDA) for such a purpose. By 1966, many complications appeared, prompting the FDA to designate liquid silicone as a “new drug” and limit its use to a study of patients getting treatment for severe facial deformities by a group of ten physicians. After only a few years, Dow Corning discontinued the project and abandoned efforts to gain FDA approval, claiming that they could not prevent misuse of the product. In the ensuing years, hundreds of thousands of patients were injected with liquid silicone despite known complications. In 1992, the FDA finally banned the injection of all liquid silicone products by physicians. However, there are many unscrupulous physicians and lay practitioners that still continue to use liquid silicone for cosmetic breast augmentation, especially outside the United States.[1–5]

The long-term sequelae of injected silicone for breast augmentation result from the devastating effects of inflammation, foreign body reaction, and granuloma formation within the breast.[1–11] Depending on the areas of injection and migratory pattern of the silicone, skin inflammation and muscle infiltration can also occur.[13–5] Although there is no clear increase risk of breast cancer associated with injected silicone, inflammatory changes hamper detection of malignancy by interfering with breast examination and imaging.[7–9] In this report, we describe two patients who presented with silicone mastitis, discuss their evaluation and surgical treatment, and present an algorithm for management of the complications of injected silicone in the breast.

CASE REPORTS

Case 1

A forty-three year old Hispanic woman presented complaining of pain, erythema, and firmness of both breasts. These symptoms initially started four years prior to presentation, and gradually worsened to the point where she was in constant pain. She admitted to a history of serial injections of silicone to both breasts in the Dominican Republic for the purpose of cosmetic augmentation. She was otherwise healthy and denied any other surgery. On exam, the breast skin was erythematous, hard, and tender [Figure 1]. Furthermore, there were numerous firm masses palpable in both breasts. There was no axillary adenopathy present. Nipple sensation was intact, although skin sensation was decreased. MRI was consistent with silicone deposition in the breast parenchyma and skin. Silicone mastitis was confirmed on tissue biopsy. The patient was treated with bilateral simple mastectomy, removing all tissues involved with silicone including skin and portions of the pectoralis major muscles [Figure 2]. The breast were immediately reconstructed using bilateral muscle-sparing free transverse rectus abdominus flaps [Figure 3]. Proline mesh was used to reinforce the abdominal wall at the time of reconstruction. Pathology results confirmed granulomatous tissue without malignancy. There were no postoperative complications and the patient was discharged after five days in the hospital. The patient recovered without incident, but was unfortunately lost to follow-up after four months.

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Figure 1

Forty-three year old woman with silicone mastitis presents with hard, painful, and disfigured breasts

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Figure 2

Bilateral simple mastectomy with removal of all tissues involved with silicone including skin and portions of the pectoralis major muscles

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Figure 3

Immediate reconstruction with bilateral free transverse rectus abdominus myocutaneous flaps

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Case 2

A forty-six year old Asian woman presented with a history of silicone injections to both breasts performed in the Philippines in twenty-five years earlier. She initially underwent bilateral subtotal mastectomy with implant reconstruction twelve year prior to presentation. However, she experienced recurrent pain, hardness, hypertrophic scars, breast asymmetry, and poor cosmesis secondary to retained silicone in the breast tissue [Figure 4]. On exam, the breast skin was firm and there were multiple areas of hyperpigmentation. The diagnosis of silicone mastitis was confirmed with MRI and tissue biopsy. The patient was treated by removal of the previous implants, completion simple mastectomy including involved skin, and placement of bilateral subpectoral tissue expanders. She underwent serial tissue expansion in the office and finally had placement of breast implants four months later. Another operation involved nipple reconstruction. The patient completed reconstruction with areolar tattooing in the office. She did well and was very pleased with the final results.

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Figure 4

Forty-six year old woman with incomplete treatment of silicone mastitis. Retained silicone results in persistent formation of granulomatous tissue

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DISCUSSION

Although the injection of liquid silicone into breasts as a method for augmentation was generally abandoned in the 1970's, illicit silicone injections are still performed today. The combination of a desire for larger breasts, a false sense that silicone injections are simple and safe, and a relatively cheap price will continue to influence uneducated patients to undergo this risky procedure. A high-index of suspicion is required when evaluating patients presenting with painful and firm breasts and a history of silicone injection should always be sought. Breast examination and imaging for breast cancer screening is obscured secondary to the inflammatory effects of injected silicone.[7–10] Magnetic resonance imaging is the most useful imaging modality for the diagnosis and evaluation of silicone-injected breasts and associated liquid silicone migration. The typical MRI findings of silicone particles are well documented- hyperintensity on T2-weighted images, intermediate signal intensity on nonfat-supressed T1-weighted images, and usually low signal intensity on fat-suppressed T1-weighted images without definite enhanc ement.[1213] An absence of breast lesion enhancement in post-contrast MRI studies is believed to reliably exclude malignancy.[14]

The goal of treatment is the complete removal of silicone from the breast. In fact, incomplete removal of silicone often results in continued symptoms.[2–5] Fortunately, there is no clear link between the inflammatory changes secondary to silicone deposition in breast tissue and an increased risk of breast cancer. Anecdotal reports, however, suggest that the difficulty in examination and imaging contributes to a delay in the diagnosis.[7–10] If the patient has a family or personal history of an increased risk of breast cancer, a low threshold for bilateral mastectomy with sentinel node biopsy is recommended.[7–10] There are only a handful of articles focusing on the strategy for management of silicone mastitis.[1–5] Clinical evaluation should elicit a history of injected silicone [Figure 5]. Infection should always be treated immediately and prior to definitive surgery.[611] Magnetic resonance imaging is recommended to confirm silicone deposition and to serve as a baseline for future breast screening. Image-guided biopsy is performed to exclude malignancy and to confirm silicone mastitis.[1–5] We propose a low threshold for bilateral mastectomy, including resection of involved breast skin, in order to minimize the occurance of retained silicone. Breast reconstruction is best performd immediately and reconstructive options include use of implants or autologous tissue. If breast skin is involved, autologous tissue reconstruction is usually required. However, tissue expansion may be utilized in some patients with smaller skin defects.

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Figure 5

Algorithm for the evaluation and treatment of silicone mastitis

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CONCLUSION

The diagnosis of silicone mastitis requires a high index of suspicion. Patients presenting with signs of chronic inflammation in the breasts should always elicit a history of silicone injection. An agressive management strategy is recommended due to the increased challenges in detecting breast cancer in this setting. We advocate resection of all tissues involved with silicone in order to avoid persistent symptoms and future complications. In our experience, immediate breast reconstruction results in the best aesthetic outcomes and the most satisfied patients.