Adult‐onset renal cell carcinoma associated with Xp11.2 translocations/TFE3 gene fusion with smooth muscle stroma and abnormal vessels

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Abstract
Renal cell carcinoma (RCC) associated with Xp11.2 translocation/TFE3 gene fusion has been recently identified. Herein is presented a case of RCC with Xp11.2 translocations/TFE3 gene fusions with unusual histological findings. A 68‐year‐old Japanese woman was incidentally found to have a renal mass on CT. Histological examination showed clear cell neoplasm with alveolar and papillary growth patterns. The nuclear atypia corresponded to Fuhrman grade 3. Additionally, smooth muscle stroma was observed and abnormal vessels showing a heterogeniety in thickness were also identified. On immunohistochemistry, neoplastic cells were diffusely positive for transcription factor E3 (TFE3) and Melan A, and focally positive for CD10 and RCC marker. The smooth muscle stroma was positive for α‐smooth muscle actin and h‐caldesmon, but reverse transcription–polymerase chain reaction of the tumor using frozen material could not detect any previously reported chimeric transcripts including ASPL‐TFE3, PRCC‐TFE3, CLTC‐TFE3, PSF‐TFE3 or NoNo‐TFE3. G‐band karyotype was unsuccessful. Pathologists should pay attention to the afore‐described unusual stromal reaction of adult‐onset RCC associated with Xp11.2 translocations/TFE3 gene fusions.

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