Rhabdoid carcinoma of anal canal: role of electron microscopy and immunohistochemistry in establishing lineage.

ABSTRACT Rhabdoid carcinoma is a high-grade carcinoma with rhabdoid features and it is different from rhabdoid tumors that are broadly defined as malignant neoplasms with rhabdoid cellular appearance found primarily in the pediatric population, but adult cases have been reported in many anatomic locations. To date, no cases of anal canal rhabdoid carcinoma have been reported in the adult or pediatric population. We are reporting the first case of anal canal rhabdoid carcinoma, found in a 75-year-old male.