Diagnostic pitfalls in the diagnosis of soft tissue bladder tumors in pediatric patients

This is a case report of a low-grade leiomyosarcoma of the bladder in a four-year-old girl. The pitfalls in diagnosing a soft tissue tumor of the bladder in pediatric patients are discussed. This case is particularly instructive because the differential diagnosis was broad, difficult, and of serious consequence. This report discusses the process by which histologic, immunohistologic and ultrastructural data were used to sidestep the pitfalls in diagnosing this unusual tumor. Clinical follow-up data bearing out our conclusion are also presented.