Ultrasonographic and MR findings of alveolar soft part sarcoma.
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.
Lai
Yi-Chen
YC
Department of Radiology, Taipei Veterans General Hospital, and National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.
Chiou
Hong-Jen
HJ
Wu
Hung-Ta Hondar
HT
Chou
Yi-Hong
YH
Wang
Hsin-Kai
HK
Chen
Paul Chih-Hsueh
PC
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