Typical roentgenological sign for a persistent ulcus duodeni.
Indentation (incisura) with niche of duodenal cap. Typical ronetgenological sign for a persistent ulcus duodeni.
- Å. O. Åkerlund:
Röntgenologische Studien über den Bulbus duodeni mit besonderer Berücksichtigung der Diagnostik des Uterus duodeni. Acta Radiologica. Supplementum (Stockholm). Volume I, Stockholm, 1921.
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