{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T11:01:59Z","timestamp":1788519719690,"version":"build-2803163510"},"reference-count":26,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[1987,7,1]],"date-time":"1987-07-01T00:00:00Z","timestamp":552096000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Vet Pathol"],"published-print":{"date-parts":[[1987,7]]},"abstract":"<jats:p>Seventeen paragangliomas were identified in a retrospective review of 200 NTP\/NCI carcinogenicity studies in F344\/N rats that served either as control or treated animals. Most tumors were grossly visible and located in the retroperitoneum adjacent to the vertebrae and aorta near the kidneys. Three microscopically detected paragangliomas were found at the base of the heart. Microscopically, neoplastic cells were in nests separated by reticulin fibers and capillaries. Argyrophil granules were in the cytoplasm of the retroperitoneal and mediastinal paravertebral tumors. Dense granules were found in the one tumor examined ultrastructurally. Some tumors had areas of necrosis and tumor emboli were present in the lumen of the abdominal aorta and vena cava adjacent to the tumor with metastases present in pulmonary vessels. The incidence of retroperitoneal neoplasms was 3 times more frequent in male than in female F344\/N rats.<\/jats:p>","DOI":"10.1177\/030098588702400405","type":"journal-article","created":{"date-parts":[[2017,1,15]],"date-time":"2017-01-15T12:36:14Z","timestamp":1484483774000},"page":"315-322","source":"Crossref","is-referenced-by-count":13,"title":["Pathologic Features of Abdominal and Thoracic Paragangliomas in F344\/N Rats"],"prefix":"10.1177","volume":"24","author":[{"given":"L. 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