CASE REPORT: PDF OnlyUltrasonographic and MR Findings of Alveolar Soft Part SarcomaLai, Yi-Chena, c; Chiou, Hong-Jena, c, *; Wu, Hung-Ta Hondara, c; Chou, Yi-Honga, c; Wang, Hsin-Kaia, c; Chen, Paul Chih-HsuehbAuthor Information aDepartment of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C. bDepartment of Pathology and Laboratory Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C. cNational Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C. *Correspondence to: Dr Hong-Jen Chiou, Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei 112, Taiwan, R.O.C. E-mail: [email protected] Received: November 18, 2008; • Accepted: January 13, 2009. Journal of the Chinese Medical Association: June 2009 - Volume 72 - Issue 6 - p 336-339 doi: 10.1016/S1726-4901(09)70382-X Metrics 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. © 2009 by Lippincott Williams & Wilkins, Inc.