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DOI: 10.1055/s-0028-1098121
© Georg Thieme Verlag, Stuttgart
Der „Pseudopylorus” — Häufigkeit und diagnostische Bedeutung —
Publikationsverlauf
Publikationsdatum:
08. Dezember 2008 (online)
![](https://www.thieme-connect.de/media/endoscopy/197102/lookinside/thumbnails/10.1055-s-0028-1098121-1.jpg)
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