E. Castella et al., FINE-NEEDLE ASPIRATION BIOPSY OF METAPLASTIC CARCINOMA OF THE BREAST - REPORT OF A CASE WITH ABUNDANT MYXOID GROUND SUBSTANCE, Diagnostic cytopathology, 14(4), 1996, pp. 325-327
Metaplastic carcinoma (MC) is an uncommon neoplasm of the breast. Ther
e are several variants of MC depending on the dominant histologic patt
ern. The components include overt infiltrating ductal carcinoma, exten
sive squamous differentiation and spindle cell proliferation with or w
ithout chondroid or osseous heterologous elements. In FNA smears, only
57% of cases show both ductal carcinoma and metaplastic component. Th
us, in almost one half of the cases, the diagnosis is not possible by
FNA. Often it is difficult to define the epithelial or sarcomatous cha
racter of malignant cells. We describe a case of metaplastic carcinoma
of the breast studied by fine-needle aspiration cytology in which myx
oid ground substance was the dominant feature in the cytology smears.
The rest of the material was composed of scanty isolated atypical cell
s with large and irregular nuclei. It is important to bear in mind the
diagnosis of MC and make a careful search for atypical cells when the
cytological smears ave mainly composed of myxoid ground substance. (C
) 1996 Wiley-Liss, Inc.