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J Korean Radiol Soc. 1993 Apr;29(2):295-299. Korean. Original Article.
Kim SA , Kim KH , Lee BH , Chin SY .

We retrospectively analyzed the clinical and CT manifestation of 12 patients with nonlymphomatous renal metastases from eight different sites. Primary sites were lung(2), liver (2), stomach(2), uterine cervix (2), pancreas(1), rectum(1), penis (1), and unknown primary site(1). In all patients, clinical symptoms and laboratory findings were nonspecific. Major CT findings of renal metastases were multiple, small, hypodense lesions concomitant with multiple organ involvement. Although there are few differential points between renal cell carcinoma and metastasis, the single most important differential point was the presence of mass lesion on location other than kidney and in such case, the lesion on kidney proved to be metastasis usually. In cases with remission of primary malignancy, biopsy of new renal lesion seemed to be indispensable.

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