MRI appearance of massive renal replacement lipomatosis in the absence of renal calculus disease

Renal Sinus Pathologies Depicted by CT Imaging: A Pictorial Review

Diverse conditions comprise the spectrum of renal sinus pathologies, which have diagnostic and therapeutic implications for patients. Using CT imaging as a lens, this exhaustive review examines the representation of these pathologies. The article begins with a concise synopsis of renal anatomy and the specialized CT methodologies utilized to achieve excellent visualization. Transformational cell carcinoma, leiomyosarcoma, renal cell carcinoma, multilocular nephroma, and lymphoma are among the tumoral origins of the renal sinus pathologies that are investigated. Further, vascular pathologies including fistulas, hematomas, and aneurysms are included in the discourse, along with parapelvic and peripelvic cysts, and lipomatosis. In addition to urolithiasis and encrusted uretero-pyelitis, the review examines the consequences of metal toxicity and non-neoplastic conditions. With a focus on critical CT imaging findings that aid in the provision of an accurate diagnosis, every pathology is meticulously examined. With the intention of improving clinical decision-making and patient care, this article intends to function as a valuable resource for radiologists, clinicians, and researchers who are engaged in the interpretation and comprehension of renal sinus pathologies.

Renal Replacement Lipomatosis-A Rare but Often Underdiagnosed Cause of Progressive Renal Damage in Calculus Disease

Renal replacement lipomatosis is a rare condition characterized by extensive fat deposition in hilum with parenchymal thinning and progressive detoriation of function.^1-4 Though uncommon, it should be considered as a possibility in patients with history of intervention for stone disease.^5,6 Correct diagnosis can be easily established by cross sectional imaging and is helpful to counsel patients about the possibility of progressive functional detoriation and poor salvageability of the affected kidneys.^7-10 Here, we present 2 patients with previous history of intervention for calculus disease who had developed progressive renal damage due to RRL with one patient ultimately needing nephrectomy.

Extensive renal sinus lipomatosis in xanthogranulomatous pyelonephritis simulating liposarcoma

Renal replacement lipomatosis is a condition characterized by varying degrees of renal parenchymal atrophy and perirenal fibrofatty proliferation secondary to chronic inflammation such as xanthogranulomatous pyelonephritis. In severe cases, imaging findings can be misdiagnosed as retroperitoneal liposarcoma.