Renal Sinus Myelolipoma Coexistent With Renal Pelvis Papillary Transitional Cell Carcinoma: A Case Report

Greaves, Wesley O.; Khanna, Pawini; DeLellis, Ronald A.; Glasser, Leslie; Wang, Li

doi:10.1177/1066896908325878

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Primary neoplasms of the renal sinus are rare and can originate from any of the tissue elements present 1. Examples include angiomyolipoma, anastomosing hemangioma, “myxoma,” solitary fibrous tumor, leiomyoma, lymphoma, immunoglobulin (Ig) G4–related disease, and well-differentiated/dedifferentiated liposarcoma 2–9. Myxoid lesions of the renal sinus, in particular, may present a diagnostic challenge because although myxoid liposarcoma occurring in the retroperitoneum is rare,10 well-differentiated liposarcoma with myxoid change is not infrequent in this location, including in perirenal soft tissue 11…”

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“…1 Examples include angiomyolipoma, anastomosing hemangioma, "myxoma," solitary fibrous tumor, leiomyoma, lymphoma, immunoglobulin (Ig) G4-related disease, and well-differentiated/dedifferentiated liposarcoma. [2][3][4][5][6][7][8][9] Myxoid lesions of the renal sinus, in particular, may present a diagnostic challenge because although myxoid liposarcoma occurring in the retroperitoneum is rare, 10 well-differentiated liposarcoma with myxoid change is not infrequent in this location, including in perirenal soft tissue. 11 Tanas et al 12 described a pseudosarcomatous fibroblastic/myofibroblastic proliferation in the perinephric adipose tissue in nephrectomy specimens with renal cell carcinoma.…”

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Myxoid Pseudotumor Involving the Renal Sinus

Hogan

McKenney

Cox

et al. 2022

American Journal of Surgical Pathology

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We describe 33 cases of myxoid pseudotumor involving the renal sinus from 31 patients. Patients included 21 men and 10 women, ages 30 to 95 years. Twenty-seven cases (82%) had an associated malignancy, including urothelial carcinoma of the renal pelvis (22 cases), clear cell renal cell carcinoma (3 cases), urothelial carcinoma of the bladder (1 case), and poorly differentiated carcinoma of uncertain lineage (1 case). The remaining 6 (18%) had no associated malignancy and included 3 nephrectomies for ureteral stricture, 2 ureteropelvic junction repairs, and 1 resection of a “periureteral mass” (subsequently shown to be myxoid pseudotumor). Myxoid pseudotumor was identified by preoperative computed tomography imaging in 2 patients (6%) and identified by the gross dissector in 9 cases (27%). The mean size was 14 mm (range: 5 to 38 mm). All cases had an admixture of adipocytes, myxoid stromal matrix, variable collagenization, and a hypocellular population of bland spindled and stellate stromal cells. No multilobated atypical stromal cells were present. Clinical follow-up was available for 28 patients (90%), ranging from 1 to 132 months (mean: 24.6 mo). No patients had adverse events related to the myxoid pseudotumor. Myxoid pseudotumor of the renal sinus is often associated with a variety of adjacent neoplastic and non-neoplastic conditions and may present as a mass lesion detectable by imaging and/or gross inspection. Awareness of this benign process is important to avoid confusion with a neoplasm, especially liposarcoma.

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