21 December 2006 – Case of the Week #68
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We thank Dr. Carmen Luz Menéndez, staff Pathologist at Hospital de Cabueñes, Gijón, Asturias, Spain, for contributing this case. We invite you to contribute a Case of the Week by sending an email to [email protected] with microscopic images (any size, we will shrink if necessary) in JPG or GIF format, a clinical history, your diagnosis and any other images (gross, immunostains, EM, etc.) that may be helpful or interesting. We will write the discussion (unless you want to), list you as the contributor, and send you a check for $35 (US) for your time after we send out the case. Please only send cases with a definitive diagnosis.
Case of the Week #68
An 84 year old woman had a total mastectomy with axillary dissection for a breast nodule. The main mass was 5 x 3.5 cm, and a 2 cm mass was nearby.
The tumor was negative for ER, PR and HER2.
What is your diagnosis?
(scroll down to continue)
Invasive apocrine carcinoma with an in situ component
Invasive apocrine carcinoma is an uncommon subtype of breast carcinoma, representing 1-4% of all carcinomas. It typically affects older women than infiltrating ductal carcinoma (Breast Cancer 2002;9:43). Grossly, it may present as a mural nodule within a cyst. Microscopically, the tumors are composed of cells with distinct cell margins, eosinophilic cytoplasm and granules. They have vesicular nuclei with prominent nucleoli, and may have glands with apocrine snouts. This diagnosis should be limited to tumors with widespread apocrine change and obvious malignancy.
These tumors are immunoreactive for GCDFP-15, although less often in advanced tumors (Histopathology 2005;47:195). They are also frequently positive for p53 and androgen receptor, and the cytoplasmic granules are PAS positive. As in this case, the tumor cells are negative for ER, PR and bcl2 (lymphoycytes serve as a positive internal control). A recent report suggests that B72.3 may be a more sensitive and specific marker than GCDFP-15 (APMIS 2006;114:712)
Nat Pernick, M.D., President
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