Anaplastic Wilms' tumor with rhabdomyosarcomatous differentiation

Chondrosarcoma of bone as second tumor after diffuse anaplastic Wilms' tumor: diagnosis by fine-needle aspiration cytology

A 6-yr-old boy already treated (surgery and chemotherapy) for a diffuse anaplastic Wilms' tumor discovered at the age of 10 mo, presented with a large tumor in the left femur. This proved to be a chondrosarcoma after fine-needle aspiration cytology, a diagnosis later confirmed by histology of the tumor. The patient was treated with marginal excision and prosthetic replacement but died 1 yr after this operation with lung metastasis. It is proposed that this case may represent a new association of unusual types of tumors.