Ileal carcinoid tumor represents after prolonged remission as a solitary breast mass.

While the metastatic spread of breast cancer is well documented, the breast is seldom a site for metastasis. Non-mammillary cancers can involve the breast or axilla, though this is exceedingly rare with few reported instances. Here, we present the case of a 62-year-old woman who attended an outpatient breast clinic with a history of an ileal carcinoid tumor complicated by multi-organ metastasis. Her disease was in clinical remission for several years, though she recently re-presented with a single solitary lesion to the breast that was later confirmed as a recurrence of her carcinoid tumor. This serves as an important reminder that the breast can indeed be a site for metastasis. As metastatic breast lesions can often be difficult to diagnose, it is essential to obtain a thorough medical history in order to determine the appropriate clinical course.

Non-implant associated primary cutaneous anaplastic large cell lymphoma of the breast.

Anaplastic large cell lymphomas (ALCL) comprise a group of rare, related T-cell neoplasms that typically present on the extremities. Infrequently, cutaneous ALCL can involve the breast, where it is near ubiquitously associated with breast implants. Here, we present the rare case of a 70-year-old woman with primary cutaneous ALCL of the breast with no history of breast augmentation. This serves as an important reminder that in some instances, breast ALCL can be idiopathic. Further, given the potential for malignancy, any changes to the breast skin should be diagnosed quickly in order to ensure rapid delivery of the appropriate treatment.

Massive adult cystic lymphangioma of the breast.

Adult cystic lymphangiomas are exceedingly rare tumors resulting from malformation of the lymphatic vessels. Like their pediatric counterparts, these lesions almost exclusively involve the head and neck. However, adult cystic lymphangiomas have been reported in several organs. Those involving the breast are exceptionally rare, with only a few reported instances. Here, we present the case of a 27-year-old woman who attended a surgical breast clinic with a 2-year history of a large, disfiguring left breast mass. Pathology was consistent with adult cystic lymphangioma of the breast. Measuring 21.0 × 20.0 × 6.0 cm3, this represents the second largest of its kind and the largest reported case in an African American patient.