title: [An atypical form of neurosarcoidosis].
abstract: BACKGROUND
  Nervous system involvement occurs in 5 to 15% of the patients with sarcoidosis. Neurosarcoidosis remains very difficult to diagnose because clinical presentation and imaging characteristics lack specificity.
  
  
  METHODS
  We report a 26-year-old man who gradually developed headaches, memory disturbance and epilepsy. CT-scan and MRI showed a temporal-parietal cystic mass, secondary to a rare and focal form of hydrocephalus, called "trapped temporal horn" revealing neurosarcoidosis.
  
  
  CONCLUSIONS
  The "entrapped temporal horn" is due to an obstacle on the cerebrospinal fluid pathway at the trigone of the lateral ventricle that seals off the temporal horn and the choroid plexus from the rest of the ventricular system. The obstacle is related to the granulomatous tissue of sarcoidosis. Therefore, the "trapped temporal horn" acts as a space occupying process, causing headaches, memory pain, hemiparesis, homonymous hemianopsia, and requires medico-surgical management.
authors.affiliation: Service de neurologie, CHU de Strasbourg, 1, avenue Molière, 67098 Strasbourg, France.
authors.forename: V
authors.initials: V
authors.lastname: Quenardelle
authors.forename: M
authors.initials: M
authors.lastname: Benmekhbi
authors.forename: J
authors.initials: J
authors.lastname: Aupy
authors.forename: C
authors.initials: C
authors.lastname: Dalvit
authors.forename: E
authors.initials: E
authors.lastname: Hirsch
authors.forename: A
authors.initials: A
authors.lastname: Benoilid
mesh_terms: D000328:Adult; D002493:Central Nervous System Diseases / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004827:Epilepsy / Q000150:complications / Q000175:diagnosis; D006261:Headache / Q000150:complications / Q000175:diagnosis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008569:Memory Disorders / Q000150:complications / Q000175:diagnosis; D059906:Neuroimaging; D012507:Sarcoidosis / Q000175:diagnosis*
keywords: Cystic mass; Entrapped temporal horn; Exclusion de la corne temporale du ventricule latéral; Hydrocephalus; Hydrocéphalie; Lésion kystique; Neurosarcoidosis; Neurosarcoïdose