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SAR Journal of Medical Case Reports
Volume-7 | Issue-03
Case Report
Low-Grade Oncocytic Tumor of the Kidney: A Distinct Emerging Pathological Entity: Report of One Case and Discussion
Manal El Beyeg, Siham Mesmoudi, Sabrine Derqaoui, Taha Yassine Aaboudech, Sarah Loubaris, Itimad Nasser, Fouad Zouaidia, Ahmed Jahid, Zakiya Bernoussi, Kaoutar Znati
Published : June 30, 2026
DOI : https://doi.org/10.36346/sarjmcr.2026.v07i03.004
Abstract
Low-grade oncocytic tumor (LOT) of the kidney has recently emerged as a distinct diagnostic entity among eosinophilic renal neoplasms. Due to its notably slow clinical progression and "mismatch" immunoprofile (CK7+/CD117-), LOT must be differentiated from renal oncocytoma and chromophobe renal cell carcinoma (chRCC). In this report, we discuss the case of a 69-year-old male patient who presented with a solid enhancing mass in the right kidney, clinically suspected to be renal cell carcinoma. A right radical nephrectomy was performed, and histological and immunohistochemical features were consistent with LOT.

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