Diagnostic and therapy of an early-stage primary leiomyosarcoma of the sigmoid colon: A case report.

Key Clinical Message: Primary leiomyosarcoma of the colon is a very rare tumor entity. Because of unspecific findings, diagnostic can be challenging. Most cases are diagnosed in advanced stages with poor overall survival.

[Difficult diagnosis: acute appendicitis and appendiceal/cecal carcinoma].

Introduction: Primary carcinoma of the appendix vermiformis/caecum is very rare. The diagnosis can often be ascertained only postoperatively by histopathological means. Preoperative diagnosis is unusual.