RESUMO
THE AIM: to present some information-about the rare primary hypertrophy of the pylorus in adults and a clinical case of a patient with this disease. MATERIALS AND METHODS: the patient A., 52 years of age, after which clinical-instrumental and laboratory research was diagnosed with infiltrative form of cancer of the pylorus with decompensated stenosis. The used: videothoracoscopy, fluoroscopy, peripheral computer electrogastrogram, local fluorescence spectroscopy. The General blood and urine tests, biochemical blood tests, PCR for the determination of tumor markers. RESULTS: The resection of 2/3 of the stomach Billroth I. histological examination of the pylorus diagnosed with hypertrophy of circular muscle fibers, to a lesser extent, hypertro- phy of the longitudinal fibers with inflammatory changes. CONCLUSION: in cases of suspected infiltrative form of cancer of the pylorus in adults differential diagnosis it is advisable to include the primary hypertrophy of his.