Primary angiosarcoma of the vulva: report of a case misdiagnosed as a benign tumor.

Primary vulvar angiosarcomas have a propensity for varied macroscopic and histologic appearance that initially may not suggest a vascular malignant neoplasm. Therefore, the rarity of the lesion and it's morphologic diversity may contribute to the high rate of misdiagnosis. We present the case of a 43-year old patient with a primary vulvar lesion, initially misdiagnosed as an angiofibroma. Microscopic examination of the recurrence together with immunohistochemical profile were in favor on a poorly differentiated angiosarcoma. Early diagnoses can improve prognoses in angiosarcomas and, in the case of recurrences, as in the present case, may lead to changes in therapy.

Endometrial adenocarcinoma with gastrointestinal differentiation - a newly described entity, with morphologic diversity.

Gastrointestinal type of endometrial carcinoma is a newly described entity for which clearly defined diagnostic criteria have only recently been published. Among morphologic criteria, gastrointestinal mucinous adenocarcinoma of endometrium must not show a typical endometrioid component. We present a case with morphologic diversity, with areas showing gastric and intestinal differentiation as well as an endometrioid-like component. However, the endometrioid-like component not only did not show classic squamous metaplasia, but was also MUC6-positive, while the positivity for ER/PR was only focal. The recognition of gastric/gastrointestinal differentiation in endometrial carcinomas is best accomplished using both morphology and immunohistochemistry rather than either alone.