Pancreatic cholera (W.D.H.A. syndrome). Histochemical and ultrastructural studies.

Results of light and electron-microscopic studies of primary pancreatic tumor and of metastasis in a new case of Pancreatic Cholera (P.C.) are reported. The primary tumor but not the metastases, contained unusual, large cystic glandular formations, lined both by pancreatic-duct- and small-intestine-like epithelia and closely connected with the endocrine proliferation. A part from a few D-cells, the endocrine tumoral cells could not be identified by histochemical stainings. Their ultrastructural pattern, with small secretory granules (diameter less than 300 nm) and numerous cytoplasmic bunches of filaments, was very similar to that of gastric and duodenal D1-cells. Normal duodenal D1-cells have been said to produce gastric inhibitory peptide, a substance structurally and biologically similar to the vasoactive intestinal peptide actually secreted by the tumor. The normal histological appearance of gastric, gallbladder, jejunal, ileal, right and left colonic mucosae is consistent with the responsibility of the tumoral secretion in the impairment of gut functions in P.C.