[Adenocarcinoma and gastro-intestinal stromal tumor: fortuitous association or a single carcinogenic agent? A report of 2 cases]. / Adénocarcinome et tumeur stromale digestifs: association fortuite ou mécanisme oncogène commun? A propos de deux observations.

The synchronous development of epithelial and stromal tumors of the digestive tract was rarely reported in the literature. Two such cases are described in this article. One is of a 44-year-old man presenting a high grade gastric stromal tumor associated with an adenocarcinoma of the large bowel. The other is of a 68-year-old man presenting an adenocarcinoma of the head of the pancreas associated with a low grade gastric stromal tumor. The hypothesis that the association is due to a simple coincidence particularly in areas with high rates of digestive cancer is proposed. A possibility of a genetic mutation or a single carcinogenic agent interacting with two tissues in the digestive tract and inducing the development of tumors of different histotype cannot be discarded.

[Retroperitoneal schwannoma. Case report]. / Le schwannome rétropéritonéal. A propos d'un cas.

Retroperitoneal schwannoma is a rare tumor originating in the neural sheath. We report the case of a 48 year-old women. She had a ten year history of lumbal pain. The abdominal sonography had revealed a left retroperitoneal tumor that compresses the left renal cavities. The abdominal CT scan visualized a 56 mm, homogenous, well demarcated, retroperitoneal mass with a low attenuation. This mass with multiple enhanced septa is separated from the left adrenal gland. The diagnosis of a cystic lymphangioma is made. We perform surgical exeresis of the tumor by a left lumbal laparotomy. The pathology examination concludes in an altered schwannoma with Antoni B patterns. Retroperitoneal schwannoma is a primary neural benign tumor with a good prognosis. The management is surgical.