[Hemoperitoneum caused by leiomyoma of the colon]. / Emoperitoneo da rottura di leiomioma del colon.

The authors report a case of colon leiomyoma revealed by spontaneous hemoperitoneum. This a rare case in which we do not have a gastrointestinal bleeding of the tumor with melena but an endoperitoneal bleeding with hemoperitoneum. Pathologic and clinical aspects of intestinal leiomyomas are discussed, most of them are found in the stomach and only 3% arise in the colon. In this case was also found an histopathological test of a carcinoid of the appendix.

[Gastric schwannoma]. / Schwannoma dello stomaco.

A rare case of gastric schwannoma is reported. A 36-year-old woman whose endoscopy showed a mucosa tumor, biopsy findings were suggestive for leiomyoma. Diagnosis was made only with postoperative histology that revealed the benign schwannoma. Immunohistochemical staining showed positivity for S-100 protein and the neuron specific enolase, schwannoma is often associated with Von Recklinghausen's disease. Surgical resection is recommended as their malignant potentiality. Gastric and small intestine localizations are often with bleeding. They also represent almost the 24% of all gastrointestinal stromal tumors (GIST) and the 4% of all primary retroperitoneal tumors.