Metastasis in Sinonasal Region Revealing a Silent Primary: A Series of 2 Cases with Review of Literature.

Metastasis to the nasal cavity and paranasal sinuses are very rare and only few cases have been reported so far. Metastatic nasal mass with silent primary renal cell carcinoma (RCC) is even rarer. So are giant cell tumors which rarely affects soft tissues whether superficial or deep. These rarely occur in nasal cavity. We would like to discuss 2 cases-one being a 74 year old female with a solitary asymptomatic extensive metastatic lesion in sinonasal area of silent primary renal cell carcinoma and other being a 38 year old female multiple lytic expansile lesions in facial and skull bones who was previously treated for giant cell tumor of long bone-tibia. We aim to bring their occurrence to notice as they are rare, to highlight importance of these tumors in differential diagnosis of sinonasal masses and treatment options for the same.