Abstract
This study describes a case of a patient with traumatic rupture of a maxillary sinus retention cyst, which had an interesting clinical presentation of unilateral rhinorrhea, mimicking a CSF leak. The diagnosis was made fortuitously by comparison of a posttraumatic CT brain examination with a CT sinus study performed 1 day earlier.
Highlights
Maxillary sinus retention cysts are common incidental findings on imaging and are usually of no clinical significance
This study was retrieved for comparison and showed a smooth, convex soft tissue mass in the left maxillary sinus consistent with a retention cyst (Fig 2)
AJNR Am J Neuroradiol 30:1121–22 ͉ Jun-Jul 2009 ͉ www.ajnr.org 1121 noted on a MR imaging study of the brain from 1 month earlier. These serial imaging studies confirmed the diagnosis of left maxillary retention cyst rupture as the cause of unilateral rhinorrhea and left maxillary sinus fluid-level
Summary
Maxillary sinus retention cysts are common incidental findings on imaging and are usually of no clinical significance. Case Report An 18-year-old white woman presented with neck pain after a traumatic injury during a cheerleading maneuver. Results of neurologic and facial soft tissue examinations were normal. CT brain examination after trauma demonstrated a fluid-level in the left maxillary sinus (Fig 1) without a facial bone fracture.
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