title: Colloid cyst: a case report and literature review of a rare but deadly condition.
abstract: BACKGROUND
  Colloid cysts are congenital benign tumors accounting for 0.2-2% of all intracranial neoplasms but representing 15-20% of all intraventricular masses. Emergency Physicians are more likely than any other group to encounter patients with a colloid cyst, a rare but life-threatening condition. The most common presenting complaint is severe episodic attacks of headache in a frontal location with associated nausea and vomiting.
  
  
  OBJECTIVE
  To describe a rare but potentially life-threatening cause of headache so that clinicians will rapidly recognize the significance of the condition and institute timely appropriate therapy.
  
  
  METHODS
  We describe the case of a 40-year-old man with a severe headache accompanied by confusion who was diagnosed with obstructive hydrocephalus associated with a colloid cyst in the third ventricle.
  
  
  CONCLUSIONS
  Recognition of this rare but important diagnosis should prompt the Emergency Physician to obtain timely treatment so that rapid neurologic deterioration, herniation, and death can be prevented. A review of the pathophysiology, diagnosis, and current management is discussed.
authors.affiliation: Department of Emergency Medicine, University of Kentucky College of Medicine, Lexington, KY, USA.
authors.forename: Roger L
authors.initials: RL
authors.lastname: Humphries
authors.forename: Charles Keith
authors.initials: CK
authors.lastname: Stone
authors.forename: Rebecca C
authors.initials: RC
authors.lastname: Bowers
mesh_terms: D000328:Adult; D056364:Colloid Cysts / Q000150:complications / Q000175:diagnosis*; D004635:Emergency Medicine; D006801:Humans; D006849:Hydrocephalus / Q000209:etiology; D008297:Male