The CT and MR Imaging Findings of Adulthood Sinonasal Alveolar Rhabdomyosarcoma with Disseminated Metastases on F-FDG PET/CT: Report of Two Cases

dren and they are far less frequent in adults. Histologically, they are classified into three subtypes: embryonal, alveolar and pleomorphic. While the head and neck are the principal locations for childhood rhabdomyosarcoma, head and neck rhabdomyosarcoma is rare in adults (1). The overall survival is worse for adults than for children (2). The major sites of metastases are lung, bone, bone marrow, liver and kidney. Several investigators have evaluated the utility of FFDG PET or PET/CT for the assessment of childhood rhabdomyosarcoma at various body sites (3-7). However, there are no reports in the medical literature regarding the F-FDG PET/CT findings of adulthood sinonasal rhabdomyosarcoma. We report herein two cases of adulthood sinonasal alveolar rhabdomyosarcoma that showed intense hypermetaboloism and disseminated metastases on F-FDG PET/CT in a 48-year-old woman and a 68-year-old woman, along with the CT and MRI findings.