title: Ultrasonographic and MR findings of alveolar soft part sarcoma.
abstract: Alveolar soft part sarcoma (ASPS) is a rare soft-tissue sarcoma, commonly occurring in children and adolescents. The tumor mostly involves the lower extremities. The prognosis of the patient depends on whether there is metastasis. We present a 19-year-old female with ASPS in her right lower leg. Grayscale and color Doppler ultrasound showed a well-defined hypoechoic lesion with hypervascularity and very low resistive index (RI). Magnetic resonance imaging revealed iso signal intensity to muscle on T1-weighted images, high signal intensity to muscle on T2-weighted images with signal voids, and good enhancement after gadolinium administration. In a mass with hypervascularity and very low RI on sonography and hypervascularity with flow voids on magnetic resonance imaging, ASPS should be considered.
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, and National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Lai
authors.forename: Hong-Jen
authors.initials: HJ
authors.lastname: Chiou
authors.forename: Hung-Ta Hondar
authors.initials: HT
authors.lastname: Wu
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Chou
authors.forename: Hsin-Kai
authors.initials: HK
authors.lastname: Wang
authors.forename: Paul Chih-Hsueh
authors.initials: PC
authors.lastname: Chen
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D018234:Sarcoma, Alveolar Soft Part / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology; D013848:Thigh; D014463:Ultrasonography