title: [The interesting case--case no. 59].
abstract: Complications after endoscopic sinus surgery are rare and occur in about 0.5 % of all cases. However postoperative symptoms such as severe cephalgia and nasal discharge of clear fluids indicate a cerebrospinal fluid leakage.
  
  
  METHODS
  A 64 year-old-patient presented to our clinic four months after an endoscopic sinus surgery complaining of the two above mentioned symptoms for about 4 weeks. In a computed tomography study of the frontobasis there was no evidence of an osseous defect. An MRI of the head revealed a bilateral temporal fluid collection as seen in bilateral chronic subdural hematoma. Therefore the present illness was no consequence of the preceding surgery.
  
  
  CONCLUSIONS
  Significant symptoms of severe postoperative complications after endoscopic sinus surgery can still be misleading. Therefore accurate diagnostic and imaging procedures are always crucial to support the initial diagnosis.
authors.affiliation: Hals-, Nasen- und Ohrenklinik und Poliklinik der Technischen Universität München, Munich. a.borrmann@lrz.tu-muenchen.de
authors.forename: A
authors.initials: A
authors.lastname: Borrmann
authors.forename: M K
authors.initials: MK
authors.lastname: Steuer-Vogt
authors.forename: A M
authors.initials: AM
authors.lastname: Frank
mesh_terms: D002559:Cerebrospinal Fluid Rhinorrhea / Q000175:diagnosis* / Q000209:etiology*; D003937:Diagnosis, Differential; D004724:Endoscopy; D006261:Headache / Q000209:etiology*; D020200:Hematoma, Subdural, Chronic / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D008297:Male; D015523:Maxillary Sinusitis / Q000601:surgery*; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis* / Q000209:etiology* / Q000601:surgery; D012008:Recurrence; D012086:Reoperation; D015524:Sphenoid Sinusitis / Q000601:surgery*; D014207:Trephining