Squamous cell carcinoma with rhabdoid phenotype of skin/soft tissue in a transplant patient: an exceptional case and review of the literature.

Squamous cell carcinoma with rhabdoid features (SCCRF) is a very rare and unusual cutaneous tumor. Here, we report an extraordinary case diagnosed by fine needle aspiration biopsy, in a 66-year-old man, status post multiple organ transplantation. The patient presented with a large ulcerating fungating mass in his forearm that had all the light microscopic and immunohistochemical features of a SCCRF. Previously six cases of SCCRF phenotype diagnosed by surgical pathology have been reported. This is the first case diagnosed cytologically. A review of the literature with emphasis on the differential diagnoses of such unusual rhabdoid-like tumors in fine-needle aspiration biopsy and the potential molecular mechanism for rhabdoid phenotype in transplant patients are discussed.