MR features of gastrointestinal stromal tumors.

We report on two patients presenting with gastrointestinal stromal tumors (GIST). The important tumor size and the marked tissular hypersignal seen on T2-weighted magnetic resonance images (MRI) should be considered as magnetic resonance (MR) features strongly indicating diagnosis of GIST.

Colonic and rectal lymphomas. A report of six cases and review of the literature.

In connection with six cases of colorectal lymphomas, including five cases of non-Hodgkin lymphomas (3 primary, 2 secondary), and one case of Hodgkin's disease, the authors review the literature concerning the general features and radiological aspects of these pathologies. The radiological signs observed during barium enemas for non-Hodgkin lymphomas are as follows: a small nodular pattern, frequently with multiple lesions (45.7% of cases), a diffuse or infiltrating pattern (25.

[Angio-immunoblastic lymphadenopathy occurring two years after a hypersensitive vasculitis (author's transl)].

The association of a drug related hypersensitive vasculitis followed two years later by angio-immunoblastic lymphadenopathy is reported. The hypothesis of a similar pathogenesis of these two conditions is discussed.