Sinonasal Adenoid Cystic Carcinoma with Rare Renal Metastasis on Fluorodeoxyglucose Positron Emission Tomography Scan: A Case Report and Literature Review.

Adenoid cystic carcinoma (ACC) of sinonasal cavity is not the frequent entity. It is characterized by indolent growth and clinical course and high rate of recurrences, perineural spread, and late metastases. We represent a patient with rare renal metastasis from sinonasal ACC in pretreatment fluorodeoxyglucose positron emission tomography-computed tomography scan, and pathological confirmation has been obtained from both the primary and metastatic sites. Metastatic lesion was asymptomatic and found during the early course of disease. As per our knowledge, this is the second case report of sinonasal ACC with renal metastasis and the first case of metastatic ACC in patient prior receiving any type treatment.