title: Retropharyngeal tendinitis: radiographic and magnetic resonance imaging findings.
abstract: OBJECTIVE
  To describe the magnetic resonance imaging (MRI) findings in retropharyngeal tendinitis.
  
  
  METHODS
  Within 1 year, four patients presenting with symptoms of retropharyngeal tendinitis were examined by radiography and MRI.
  
  
  RESULTS
  On MRI and radiographs, all patients had characteristic soft-tissue swellings and calcifications related to the tendon of the longus colli muscle situated inferior to the anterior arc of C1. MRI showed well-defined edema, with high signal in the retropharyngeal tissue anterior to C1-C5 on short T1 inversion recovery (STIR) sequences, low signal on T1-weighted sequences, and low signal in the calcification on both sequences. In addition, three patients had high signal intensity changes on STIR sequences in the atlantoaxial joint situated posterior to the anterior arc of C1.
  
  
  CONCLUSIONS
  MRI is a sensitive and accurate method in the diagnosis of retropharyngeal tendinitis. A new finding in this condition is an effusion or synovitis in the anterior atlantoaxial joint. MRI is a valuable tool in differentiating retropharyngeal tendinitis from other diagnoses such as retropharyngeal abscess, pyogenic spondylitis, and spondyloarthropathy.
authors.affiliation: Department of Radiology, Aarhus University Hospital, Aarhus, Denmark. jgeli@as.aaa.dk
authors.forename: J
authors.initials: J
authors.lastname: Gelineck
authors.forename: M
authors.initials: M
authors.lastname: Salomonsen
authors.forename: C
authors.initials: C
authors.lastname: Hviid
mesh_terms: D000328:Adult; D002114:Calcinosis / Q000175:diagnosis; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010608:Pharyngeal Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D011859:Radiography; D012680:Sensitivity and Specificity; D052256:Tendinopathy / Q000175:diagnosis* / Q000000981:diagnostic imaging