title: Computed tomography of monkey brain tumors.
abstract: Thirty-five Japanese monkeys were inoculated intracerebrally with chick embryo fibroblasts that were producing Schmidt-Ruppin strain of Rous sarcoma virus. Tumors were induced in 54.3% (19/35). Computed tomography detected tumors in 10 symptomatic animals with an average latency of 32.6 (15-43) days. At autopsy, the brains were sectioned into 5 mm slices, coplanar to the CT image. Various CT features of high- and low-density area correlated well with the histopathological findings, such as tumor, hemorrhage, necrosis, and peritumoral edema. Contrast-enhanced CT detected 10 tumors greater than 4 mm in diameter, and there was +/- 2 mm potential error in determining tumor size. Follow-up CT revealed growth of tumors in four animals and stabilization of tumor in two animals. Large brain size, 90-110 g in adult monkeys, and availability of induced tumors offer an excellent brain tumor model for CT studies.
mesh_terms: D000818:Animals; D001344:Autopsy; D001358:Avian Sarcoma Viruses; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D005354:Fibrosarcoma / Q000000981:diagnostic imaging* / Q000473:pathology; D005910:Glioma / Q000000981:diagnostic imaging* / Q000473:pathology; D008251:Macaca; D008297:Male; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D014412:Tumor Virus Infections / Q000000981:diagnostic imaging* / Q000473:pathology