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Preduodenal portal vein (PDPV) is a rare cause of duodenal obstruction. While half of PDPV cases present with obstructive findings in the neonatal period, the other half are diagnosed incidentally at advanced ages. In half of the obstructed PDPV cases, the cause of obstruction is another congenital anomaly. In our case, the aberrant ventral extension of the pancreas with PDPV caused incomplete duodenal obstruction by compressing the duodenum externally. Özet Preduodenal portal ven (PDPV), duodenal tıkanıklığın nadir bir nedenidir. Yenidoğan döneminde PDPV olgularının yarısı obstrüktif bulgularla ortaya çıkarken, diğer yarısı ileri yaşlarda rastlantısal olarak teşhis edilmektedir. Tıkanmış PDPV vakalarının yarısında, tıkanıklığın nedeni başka bir konjenital anomalidir. Bizim olgumuzda PDPV’ye eşlik eden pankreasın anormal ventral uzantısı duodenuma dıştan bası yaparak inkomplet tıkanıklığa neden olmuştu., Nadir Görülen bir Konjenital Duodenal Obstrüksiyon Nedeni: Preduodenal Portal Ven. [ High resolution figures, metrics, and more: http://lifemedsci.com/a/2022/1/oz/7.htm ] [ This article previously published as: "Somalia Turkey Journal of Medical Science 2020; 1(1): 17-19." Currently, Somalia Turkey Journal of Medical Science was merged with Life and Medical Sciences. ], {"references":["1. Knight HO. An anomalous portal vein with its surgical dangers. Ann Surg 1921; 74(6): 697-9.","2. Georgacopulo P, Vigi V. Duodenal obstruction due to a preduodenal portal vein in a newborn. J Pediatr Surg 1980; 15(3): 339-40.","3. Grosfeld JL, Rescorla FJ. Duodenal atresia and stenosis: reassessment of treatment and outcome based on antenatal diagnosis, pathologic variance, and long-term follow-up. World J Surg 1993; 17(3): 301-9.","4. 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