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Single lymphangiomyoma, rarely encountered, is a form of lymphangiomyomatosis with characteristic proliferation of smooth muscle cells in lymph nodes and vessels. We observed a case in a 47-year-old woman with no past medical history. An echography performed for menorrhage revealed a single iliac localization in the right pelvis. The precise pre-operative diagnosis was difficult, but the pathology report formally identified the tumor as an isolated form without thoracic involvement. Unlike lymphangiomatosis itself which involves pulmonary lesions and which may require complementary treatment, total exeresis of a single tumour is the only treatment necessary, as was confirmed in this case.

Immunocytochemical techniques, applied to material fixed with Bouin's fluid and using immune sera specific to various hormonal polypeptide(s), give a classification of pancreatic and pancreatico-duodenal apudomas based upon cellular functional activity. With a rane containing a minimum of five antibodies (gastrin, insulin, glucagon, somatostatin and pancreatic polypeptide), 15 tumours could be identified amongst the 22 tested. They were either "monohormonal" tumours (10 cases) or "bi- or polyhormonal" tumours (5 cases). In the remaining 7 cases, only rare cells were immunoreactive. A large number of immunoreactivities thus revealed in histological sections are clinically silent or are present in a "forme fruste".

The authors report three anatomoclinical studies concerning apparently moderately aggressive endocrine tumors developped in the sub-mucosa of the duodenal bulb (2 cases) and of the pyloro-bulbar region (1 case), not connected with the pancreas, and occuring in the absence of a parietal ectopic pancreas. Two of these tumors were ulcerous but the associated syndromes (pains and hemorrhage) did not evoke, clinically, a Zollinger-Ellison syndrome. However, examination with immunofluorescence showed the presence of immunoreactive gastrine in a large number of cells. Having found some similar cases in the literature, the authors precise the features of these silent pyloro-duodenal gastrinomas: it is a variety of carcinoids or of "carcinoid-islet cell tumors". The cells contain argyrophile granules (Grimelius stain) which correspond in electron microscopy to neuro-secretory granules that may be quite different from G. granules. In the absence of significant clinical signs and of a radio-immunologic blood test, the presence of immunoreactive gastrin in the cells is the main feature for the diagnostic of these tumors. These tumors seem to arise from the gastrin cells of the mucosa or from their precursors as is suggested by the transitional forms with the fundus of the glands. Whatever the reason of the peculiar functional behavior, these neoplasms can be easily isolated from the anonymous group of duodenal carcinoids.