[Gardner's syndrome (author's transl)].

An exact history was taken and clinical, endoscopic and histologic studies were performed in 14 family members of a case of Gardner's syndrome with triple symptomatology documented with biopsy and autopsy findings. Among the symptom-free probands five cases of colonic polyposis and three cases with gastric polyps were found. All polyps were histologically adenomatous. Dysplasias grade I and II were found repeatedly, in one 16-year-old adolescent there was already severe dysplasia within the gastric mucosal polyps. A warning is given against sub-classification of familial colonic polyposis and other syndromes within the definition of Gardner's syndrome. In future during diagnostic investigations for cases of Gardner's syndrome isolated gastric polyposis should be sought for as well as monosymptomatic colonic polyposis. Diagnostic procedures and treatment should depend on endoscopic and histological findings. Regular follow-up with endoscopic biopsies are to be encouraged not only in the diseased cases but also in all family members available.