PMC7502782_01
Magnetic resonance imaging shows the dilated small intestine (a) and the cystic lesion (b).
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This showed dilation of the small intestine and the cystic lesion (Fig. 1), which suggested intestinal atresia or duplication.
a Abdominal plain radiography shows the dilated upper jejunum. b Contrast-enhanced radiography shows the microcolon.
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Plain abdominal radiography showed a dilated stomach and upper jejunal dilation (Fig. 2a). Contrast-enhanced radiography showed that it was possible to obtain images as far as the terminal ileum, but the colon appeared as a microcolon (Fig. 2b).
a The cystic mass at the jejunal mesentery and the 360  torsion of the jejunum with the cyst are apparent. b Jejunal atresia occurred 14 cm distal to the ligament of Treitz. The difference in the diameters of the proximal and distal jejunal segments was 3:1. c Resected cystic mass and atretic jejunal segment.
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It revealed a 45-mm cystic mass at the jejunal mesentery and 360  torsion of the jejunum, along with the cyst (Fig. 3a). Treitz and a cystic mass that had developed in the mesentery of the proximal jejunal segment of the small intestine. The ratio of the diameters of the proximal and distal jejunal segments was 3:1 (Fig. 3b). The cystic mass was excised together with the atretic jejunal segment (Fig. 3c).
a Cystic spaces are apparent (HE, x100). b Immunoreaction for D2-40 shows positivity of the flattened endothelial cells lining the lymphatic spaces (anti-D2-40 antibody immunolabeling) (x100).
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Histological examination of the specimens showed intestinal atresia and a mesenteric cystic lymphangioma (Fig. 4a, b).