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J Korean Soc Radiol. 2011 Feb;64(2):117-121. English. Case Report.
Bahn YE , Lee SK .
Department of Radiology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.

We report herein two cases of adulthood sinonasal alveolar rhabdomyosarcoma that showed intense hypermetabolism and disseminated metastasis on 18F-FDG PET/CT. The contrast-enhanced CT (CECT) and gadolinium-enhanced T1-weighted images (Gd-T1WI) showed multiple rings of intense enhancement (the "botryoid sign") of the mass. Adulthood rhabdomyosarcoma should be considered when a sinonasal mass shows the "botryoid sign" on CECT or Gd-T1WI, and intense hypermetabolism with disseminated metastases on 18F-FDG PET/CT.

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