Gastrointestinal malignant lymphoma: roentgenographic features and pathologic and morphologic correlations.

By roentgenographic methods alone no certain differentiation can be made between primary and secondary gastrointestinal lymphomas, nor can the histological characteristics and the cell type be derived from the roentgenological pattern. Only in proximal small intestinal lymphomas with malabsorption does a diffuse malignant histiocytosis seem to exist. The roentgenographic presentation of a gastrointestinal lymphomatous lesion is dependent on the direction of growth of the tumor cells in the bowel wall, and is therefore accidental.