High-grade eosinophilic renal tumor/eosinophilic vacuolar renal tumor: A case report and literature review

Abstract Introduction Renal oncocytoma (RO) is a rare benign tumor of kidney, and eosinophilic vacuolated tumor (EVT) is a kind of renal oncocytoma with special morphology. EVT is a rare eosinophilic renal tumor with unique morphological, immunophenotype and molecular genetic characteristics. Its biological behavior is relatively inert and its prognosis is good. Case report This case report describes in detail a 52-year-old woman who went to the hospital for a medical examination and found that her left kidney occupied a space for 1 + months. After abdominal enhanced CT, she considered renal clear cell carcinoma, and then performed "robot-assisted laparoscopic partial left kidney resection". During the operation, a mass with a size of about 3.8*3.5cm was seen near the renal hilum in the middle part of the left kidney. After the tumor was removed, the pathological examination considered the eosinophilic vacuolar tumor of the kidney. Conclusion This case shows that EVT is a new solid tumor of kidney, and the cases are extremely rare. Clinicians and pathologists should improve their understanding of such tumors and differentiate them, so as to classify renal tumors more accurately and guide clinical treatment and prognosis evaluation.