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. 2021 Sep 1;41(5):1368–1386. doi: 10.1148/rg.2021200207

Figure 9a.

Peritoneal hydatidosis in an asymp­tomatic 49-year-old woman. (a, b) Axial CT images through the lower abdomen (a) and pelvis (b) show multiple well-circumscribed cystic lesions. The cyst along the posterior margin of the liver (arrow in a) has smooth mural calcifications. The cysts in the left upper quadrant (arrowhead in a) and pelvis (arrowhead in b) have a multiloculated appearance, with internal cysts of differing attenuation. (c) Sagittal T2-weighted image better shows the internal cyst architecture, including the floating inner membrane (straight arrow); the posterior pelvic cyst wall (curved arrow) is markedly T2 hypointense owing to the abundant collagen content. (d) Axial contrast-enhanced T1-weighted image shows enhancement of the thin walls and septa (arrow) but no internal nodularity or enhancement. Intraoperatively, there were innumerable hydatid cysts studding the peritoneum in addition to the multiple abdominal and pelvic cysts, consistent with disseminated hydatidosis, presumed secondary to a ruptured hepatic hydatid cyst.

Peritoneal hydatidosis in an asymp­tomatic 49-year-old woman. (a, b) Axial CT images through the lower abdomen (a) and pelvis (b) show multiple well-circumscribed cystic lesions. The cyst along the posterior margin of the liver (arrow in a) has smooth mural calcifications. The cysts in the left upper quadrant (arrowhead in a) and pelvis (arrowhead in b) have a multiloculated appearance, with internal cysts of differing attenuation. (c) Sagittal T2-weighted image better shows the internal cyst architecture, including the floating inner membrane (straight arrow); the posterior pelvic cyst wall (curved arrow) is markedly T2 hypointense owing to the abundant collagen content. (d) Axial contrast-enhanced T1-weighted image shows enhancement of the thin walls and septa (arrow) but no internal nodularity or enhancement. Intraoperatively, there were innumerable hydatid cysts studding the peritoneum in addition to the multiple abdominal and pelvic cysts, consistent with disseminated hydatidosis, presumed secondary to a ruptured hepatic hydatid cyst.