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Extra-organic primary tumor in pelvis: correlation of multi-detector row computed tomography, anatomy and pathology.Author information Abstract The purpose of this study was to investigate the correlation between multi-detector row CT （MDCT） features, pathological findings and the anatomic basis of extra-organic primary tumors in pelvis so as to improve the document diagnosis of these entities. We retrospectively analyzed the MDCT manifestations of 20 cases with surgically and/or pathologically evidenced diagnoses of extra-organic primary tumors in pelvis. The results showed that, in 14 cases, the tumors were located in the pelvis, and 6 of them involved both pelvis and hypogastric zone. There were 8 tumors located in the peritoneal cavity of the pelvis, and 3 of them also involved the extraperitoneal space of the pelvis. In the peritoneal cavity, 2 tumors of male patients were located in the rectovesical pouch while 3 tumors of female patients were located in the rectouterine pouch. The majority of entities in these 2 pouches were germ cell tumors （3/5 cases, 60.0%）. In the extraperitoneal space, 5 of 12 tumors were located in the pararectal space and 5 of them were located in the retrorectal space. The majority entities of these 10 cases were germ cell tumors （7/10 cases, 70.0%）. Lymphoma mainly involved paravesical and pararectal space in disorder. Calcification occurred in 6 cases, including 4 cases of teratoma, 1 case of neurilemmoma, and 1 case of malignant teratoma. The fatty element occurred in 7 masses, including 4 cases of teratoma, 1 case of malignant teratoma, 1 case of mixed germ cell tumor, and 1 case of liposarcoma. MDCT with multi-planar reconstruction （MPR） could more clearly reveal the anatomic location of the extra-organic primary tumor in pelvis, could unveil the tumor's relationship with its surrounding organs, and could help to differentiate benign tumors from malignant tumors. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2009 Feb;26（1）:75-9. PMID:19334559 [PubMed - indexed for MEDLINE]
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