NF2 and Unclassified Renal Cell Carcinoma: Inactivating NF2 GA have been described in spectrum of kidney tumors including aggressive variants such as cdRCC (29%),27 pRCC (12%),28,29 sRCC (19.2%),30 and uRCC (18%),31 as well as in more indolent mucinous and spindle cell carcinoma of the kidney.32 The frequencies of GA in histologic subtypes of renal tumors in our cohort are similar to previous studies.