Department of Hospital Pathology, The Catholic University of Korea, Seoul, Korea. ejseo@catholic.ac.kr
ABSTRACT
Borderline clear cell adenofibromatous tumors are rare with only 26 cases reported in the English literature. Five of these cases exhibited microinvasion and 4 demonstrated intraepithelial carcinoma. We report 2 cases, one typical case and the other with microinvasion. The histological findings revealed widely spaced and focally crowded, variably-sized atypical glands or tubules lined by clear, eosinophilic or hobnail cells set in a dense fibrous stroma.
One of the two cases had small solid nests or single cells in the stroma around the proliferative glands less than 1 mm in length that was considered to be a microinvasion.
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