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Citation:
Alsmair A, Guan H, Elfeky M, et al. Persistent descending mesocolon. Reference article, Radiopaedia.org (Accessed on 08 Mar 2025) https://doi.org/10.53347/rID-90636
Persistent descending mesocolon is defined as the failure of fusion of the mesentery of the descending colon with the lateral and posterior parietal peritoneum 1.
Persistent descending mesocolon is a rare congenital anomaly, in which the primitive dorsal mesocolon does not fuse with the parietal peritoneum.
CT and barium studies are the most helpful imaging modalities for the diagnosis. The typical finding is the medialisation and oblique course of the descending colon, with small bowel loops seen lateral to it 4.
It is asymptomatic in the majority of cases, but it has clinical significance as it may cause intestinal obstruction, volvulus, intussusception or internal hernia 2,3.
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1. George L. Popky, Marc S. Lapayowker. Persistent Descending Mesocolon. (1966) Radiology. doi:10.1148/86.2.327
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2.Albert Chen, Fei-Shih Yang, Shin-Lin Shih, Chin-Yin Sheu. CT Diagnosis of Volvulus of the Descending Colon with Persistent Mesocolon. (2012) American Journal of Roentgenology. doi:10.2214/ajr.180.4.1801003
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3. Kawakami, Masayo, Nakazato, Hidetsugu, Tomiyama, Takeshi, Tomori, Takehiko, Miyagi, Jun, Nagayoshi, Seiji, Ohmine, Yasushi. Laparoscopic sigmoidectomy for sigmoid colon cancer with left-sided inferior vena cava and persistent descending mesocolon. (2020) Journal of Surgical Case Reports. doi:10.1093/jscr/rjaa259
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4. Congenital positional anomalies of the colon: Radiographic diagnosis and clinical implications. (1977) Gastrointestinal Radiology. 2 (1): 49. doi:10.1007/BF02256465
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