Unusual Clinical Presentation of Carcinoma
919
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
).
A
B
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
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
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.
