PMC5894316_01
Contrast-enhanced abdomen and pelvis CT scan (A and B) Axial images show air filled collection adjacent to sigmoid colon. (C) Axial image shows air within the endometrial cavity. (D) Sagittal reformat shows air filled collection extending between the air filled endometrial cavity (straight white arrow) and the thickened sigmoid colon (curved white arrow)
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F1
The collection was seen abutting the uterus with air-fluid level within the uterine cavity [Figure 1].
PMC5894316_02
Axial images of contrast-enhanced abdomen and pelvis CT scan (A) shows heterogeneously enhancing circumferential irregular wall thickening involving the recto-sigmoid region. (B-D): Straight white arrows show air pocket in the endometrial cavity. Curved arrow in B shows thickened rectum abutting the posterior wall of lower uterus with no fat plane in between
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F2
There was loss of fat plane between the uterus and the thickened rectosigmoid colon with air pockets within the endometrial cavity [Figure 2].