The article presents a patient operated for upper gastrointestinal tract obstruction caused by a tumour of the duodenum. The histological analysis described it as hyperplasia of the Brunner’s gland. The article presents the clinical manifestation, diagnostics and therapy of this tumour. A summary of related literature to Brunner’s gland adenoma follows. This very rare benign pathology of the small intestine presents itself with no specific clinical symptomatology, often as dyspepsia or ulcerous disease. Diagnosis is based on endoscopy and radiographic methods. Therapy is most commonly surgical.

        Key words: duodenal tumour – Brunner’s gland – adenoma – brunneroma