Sarcoidosis Presenting as Late Seroma Mimicking Breast Implant-Associated Anaplastic Large Cell Lymphoma.

Late seroma related to breast silicone implants is a rare complication. Interest for its characterization has grown after its association with the recently described breast implant-associated anaplastic large cell lymphoma. The differential diagnosis includes infectious diseases, mechanical and traumatic causes, tumors, postpartum seroma, and inflammatory, allergic, or idiopathic causes.Sarcoidosis has been associated with breast silicone implants over the last decades, but it has never been reported as a cause of breast effusion. We describe a rare presentation of sarcoidosis as a late breast implant seroma simulating the clinical features and radiologic findings of breast implant-associated anaplastic large cell lymphoma and highlight that sarcoidosis can be suspected by the presence of nonnecrotizing epithelioid granulomas in the cytology, with a characteristic inverted ratio of CD4/CD8 T cells.The aims of this article are to review the current evidence about sarcoidosis related to silicone implants and breast cancer, provide a new alternative in the differential diagnosis of late seroma, and advise the scientific community how early implant removal can improve the disease.