title: Evaluation of paragangliomas presenting as a cervical mass on color-coded Doppler sonography.
abstract: OBJECTIVE
  To assess the potential of color Doppler sonography to identify cervical mass lesions as paragangliomas.
  
  
  METHODS
  Prospective evaluation.
  
  
  METHODS
  Fifteen patients with 18 paragangliomas (13 carotid body tumors, 3 vagal and 2 temporal) presenting as a mass in the neck were investigated using color Doppler sonography.
  
  
  RESULTS
  All paragangliomas presented in B-mode sonography as solid, well-defined, and hypoechoic tumors. Color Doppler imaging revealed hypervascularity in 15 (82%) tumors. No flow signal was detected in 3 carotid body tumors at standard velocity encoding (30 cm/s). Only carotid body tumors could be assessed in their full extent. Temporal and vagal paragangliomas were only partially visible. Carotid body tumors showed a splaying of the carotid bifurcation with displacement of the external carotid anteriorly and both the internal carotid and the internal jugular vein posteriorly. Anterior displacement of both carotid arteries and posterior displacement of the internal jugular vein was found in the 3 vagal paragangliomas. The caudal tumor extension of the 2 temporal paragangliomas was recognized within the expanded lumen of the internal jugular vein. According to the direction of tumor growth and vascular supply, the intratumoral flow signal was predominantly directed upward in carotid body tumors and downward in vagal and temporal paragangliomas.
  
  
  CONCLUSIONS
  Based on the appearance in the B-mode, the hypervascularity, the relationship toward the carotid arteries and the internal jugular vein, and the intratumoral flow direction, color Doppler sonography was able to establish the diagnosis and type of a paraganglioma.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Neuroradiology, University Hospital Zurich, Frauenklinikstrasse 10, CH-8091 Zurich, Switzerland.
authors.forename: Sandro J
authors.initials: SJ
authors.lastname: Stoeckli
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schuknecht
authors.forename: Hatem
authors.initials: H
authors.lastname: Alkadhi
authors.forename: Ugo
authors.initials: U
authors.lastname: Fisch
mesh_terms: D002345:Carotid Body Tumor / Q000098:blood supply / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D010039:Otorhinolaryngologic Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000601:surgery; D010235:Paraganglioma / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000601:surgery; D011379:Prognosis; D012039:Regional Blood Flow / Q000502:physiology; D014057:Tomography, X-Ray Computed; D018615:Ultrasonography, Doppler, Color