Rosen's Breast Pathology, 4e

919

Unusual Clinical Presentation of Carcinoma

A

B

FIG. 33.25.  Ectopic breast tissue in axilla. A: A mammary duct and lobular glands found in the adipose tissue of an ALN dissection. B: Sclerosing lobular hyperplasia involv- ing ectopic axillary breast tissue. C: Lactational hyperpla- sia seen in a needle core biopsy of a “high” axillary mass in a woman in the second trimester of pregnancy. Lacta- tional change is present ( inset ). The cytologic diagnosis of carcinoma arising in ectopic breast tissue has been reported 214–218 ; however, the unequiv­ ocal diagnosis of a primary carcinoma arising in ectopic breast tissue can be made only if there is histologic confirma­ tion of intraductal carcinoma and benign mammary glan­ dular parenchyma beyond the normal extent of the breast

C

radiotherapy 201 has been reported. The use of chemotherapy will depend on the stage of the carcinoma. Breast tissue in a teratoma is a potential site for occult mammary carcinoma (Fig. 33.28). Extramammary Paget disease has been described in ovarian and retroperitoneal teratomas, 210–212 including one with invasive carcinoma. 213

FIG. 33.26.  Residual breast tissue with carcinoma after mastectomy. A: Residual breast tissue in the chest wall 8 years after a mastectomy. B: A mass at this site contained cribriform intraductal carcinoma and invasive well-differentiated ductal carcinoma.