A rare pure lymphoepithelioma-like carcinoma of the renal pelvis mimicking upper tract urothelial carcinoma: A potential diagnostic pitfall

摘要

Lymphoepithelioma-like carcinoma (LELC), morphologicallyidentical to primary lymphoepithelioma in the nasopharynx, rarely occurs in the urinary tract and is mostlyfound in the urinary bladder [1]. LELC is classified intothree subtypes, based on the amount of LELC in the tumor:pure (100%), predominant (50e99%), and focal (<50%). Wereport the fifth case of renal pelvic pure LELC in the literature [2e5], and the first case of renal pelvic LELC inTaiwan, which mimicked upper tract urothelial carcinoma(UC) in clinical features, imaging, urine cytology, and ureteroscopic tumor biopsy.