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- W2058804038 abstract "Myomatous tumors of the kidney or renal capsule are uncommon, and the number recorded in the literature is small. None of the reported cases have been examined angiographically, and the vascular pattern of such tumors is therefore unknown. We recently had the opportunity of studying a patient in whom a calcified mass was seen arising from the lower pole of the right kidney. The case is reported because of the rare nature of such tumors. Case Report The patient, a 55-year-old Negress, was hospitalized for evaluation of a breast mass. The patient's work-up, including metastatic survey, revealed a 4.5 × 3 cm rounded mass arising from the lower pole of the right kidney. The mass contained conglomerate, irregular areas of calcification, and intravenous urography showed it to be closely associated with the lower pole of the right kidney. There appeared to be, however, a lucent cleavage plane between the kidney and the mass, a finding confirmed by nephrotomography (Fig. 1). Both kidneys excreted contrast medium normally, and, although there was evidence of extrinsic pressure on the lower pole of the right kidney, there was no distortion of the collecting system. Review of previous films revealed that the calcified mass had been present for at least two years and had not changed significantly in that time. Because of the possibility that it could be a slow-growing hypernephroma, study of the vascular supply of the tumor was considered advisable. The arteriogram revealed minimal vascularity of the calcified mass, which was supplied by an extension of an interlobular renal artery, a small capsular branch entering its periphery, and a small branch arising from a lumbar artery (Fig. 2). No abnormal tumor vessels were noted, and no tumor blush was seen. The preoperative diagnosis was a benign tumor of the renal capsule. Exploration of the right renal mass through an anterolateral incision revealed upon opening, Gerota's fascia, a hard, yellowish-tan, irregular mass about the size of a golf ball. It was easily mobilized from the surrounding tissues and was found to be adherent to the renal capsule at one point. It was completely excised together with a 1 cm section of the renal capsule. The mass did not involve the kidney parenchyma itself but indented the lower pole of the right kidney. Pathologically, the specimen was firm, measured 4.5 × 3 × 2 cm, and weighed 80 g. On the cut surface, calcific lesions measuring from 1 to 5 mm in diameter and extending out to the external surface of the tumor were noted. Microscopic sections disclosed a mass of smooth muscle tissue arranged in whirls and cords. No mitotic figures were seen. Pathological diagnosis was benign leiomyoma. Discussion Leiomyomatous tumors involving the kidney may be of three types : (a) small, frequently multiple leiomyomas situated beneath the capsule and diagnosed only at autopsy; (b) large solitary growths producing symptoms and found during life; and (c) those with definite sarcomatous change." @default.
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- W2058804038 date "1969-04-01" @default.
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- W2058804038 title "Leiomyoma of the Renal Capsule" @default.
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- W2058804038 doi "https://doi.org/10.1148/92.5.1006" @default.
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