Der „Pseudopylorus” — Häufigkeit und diagnostische Bedeutung —

Summary

A pseudopylorus can be found in nearly 10% of all patients who underwent gastroscopic examination (patients with previous B I or B II gastric resection excluded).

The pseudopylorus is represented by a ring-like antral mucosal structure variable in shape and size which is situated proximal to the pylorus and, thus, may endoscopically simulate a true pyloric opening. Visual identification by means of endoscopy is possible only in a few cases. “Trans-pyloric” biopsy is an exellent and easy method for differentiation. If histology reveals “antral” mucosa the ring-like antral formation most probably is a pseudopylorus, if “duodenal” mucosa is found the antral opening with high certainty represents the true pylorus. The most common underlying cause of a pseudopylorus is an active prepyloric ulcer or an ulcer in the pyloric canal; other causes are prepyloric scars, neoplasma or polyps.

Key-Words

Pseudopylorus - transpyloric biopsy - prepyloric ulcer