1. Duodenal Pseudotumor With Ball-Valve Syndrome
2. 2. T Zenda, T Masunaga, and T Taguchiet al.A case report of gastroduodenal intussusception caused by a leiomyoma arising from upper gastric body (so-called ball valve syndrome).Jpn. J. Gastroenterol.1994;91: 122833 (in Japanese).
3. 4. CM Fenoglio-Preiser, K Perzin, and RR. PascalTumours of the Large and Small Intestine, AFIP fascicle, 2nd series. Washington DC: Armed Forces Institute of Pathology, 1990.
4. Adenomas of the small intestine: A clinicopathologic review of 51 cases and a study of their relationship to carcinoma