C. Rosacea-like angiosarcoma
Microscopic examination findings revealed a dissecting vascular proliferation through the entire dermis. Ectatic vascular channels were lined by atypical plump endothelial cells (Figure, B and C). Immunohistochemistry staining results were negative for Human herpesvirus 8 (Figure, D). These findings were diagnostic of cutaneous angiosarcoma (CA).
Results of a positron emission tomography/computed tomography scan revealed only mildly avid malar subcutaneous thickening consistent with CA (American Joint Committee on Cancer tumor-node-metastasis staging T2aN0M0G2, stage IIB). When feasible, standard treatment entails surgery with or without radiation; however, owing to this patient’s comorbidities, poor performance status, and disease extent, reduced-dose intravenous paclitaxel (60 mg/m2) was initiated as palliative therapy. After completing 6 months of 120-mg paclitaxel weekly treatment, a partial response was obtained. Because of worsening overall health, no additional treatments were added. He was transitioned to home hospice.