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(a) Drawing of a midsagittal plane through the female pelvis shows the peritoneal reflection that divides the pelvis into the peritoneal and extraperitoneal compartments. (b) Sagittal T2-weighted MR image shows the anterior peritoneal reflection (yellow line). The presence of ascites makes it easy to identify the anterior peritoneal reflection. Extra-P = extraperitoneal compartment, Intra-P = intraperitoneal compartment.
