[Mature cystic teratoma of the ovary with differentiated and secretive gastric mucosa].

Large teratomas with gastric mucosa are rare. We report a case of mature cystic teratoma in an ovary of a young woman. Tumor growth was large and rapid enough to displace abdominal organs.

[Gastric epithelioid angiosarcoma, a biopsy diagnostic pitfall].

We report the case of a 70-year-old man who presented a bulky gastric mass. The diagnosis of poorly differenciated adenocarcinoma was made on the biopsy. On surgical specimen, the final diagnosis of gastric angiosarcoma with secondary intestinal involvement was established.

[Solid breast nodules: reliability of ultrasonographic and cytological studies].

The authors evaluated the usefulness of US study and US guided fine-needle aspiration cytology (FNAC) in 144 solid breast lesions. US studies was performed with a 10-MHz transducer. Homogenous hypoechogenicity, elongation along the general orientation of the breast tissue plane, regular margins, and intensification of posterior echoes were considered as benign signs.

[Orthotopic implantation of human colon cancers into nude mice. Methodology and physiopathological value].

Objective: The xenograft of human cancers into athymic nude mice makes it possible to obtain abundant tumour material and deepen biological characterization. Usually, the tumours are grafted into the subcutaneous tissue whose environment is indeed different from that of original colon cancer.

Methods: In order to transplant tumours into an orthotopic environment, intra-caecal implantation of colon cancers was performed.