title: Brain abscess formation within an endodermal cyst of the frontal lobe: case report.
abstract: A 38-year-old man with a right frontal lobe cyst was treated by endoscopic cystoventriculostomy in 1998. Cyst capsule histology revealed surprisingly an endodermal cyst. The patient was reoperated for cyst expansion by endoscopic re-cystoventriculostomy in 2005. In 2007, the patient suffered from brain abscess formation within the cyst which was punctured. The history was positive for a dental infection. In 2008, a recurrent brain abscess in the cyst occurred. The cyst was completely resected. There was no history of trauma or sinusitis. In all, endodermal cysts may mimic a paraxial arachnoid cyst. It may predispose for recurrent brain abscess formation - especially due to bacteraemia. This report confirms earlier presentations that endodermal cysts should be resected, and endoscopic cyst opening is not sufficient.
authors.affiliation: Department of Neurosurgery, Johannes-Gutenberg-University, Mainz, Germany. doerthe.keiner@gmx.de
authors.forename: D
authors.initials: D
authors.lastname: Keiner
authors.forename: M R
authors.initials: MR
authors.lastname: Gaab
authors.forename: H
authors.initials: H
authors.lastname: Ostertag
authors.forename: C
authors.initials: C
authors.lastname: Sommer
authors.forename: J
authors.initials: J
authors.lastname: Oertel
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000175:diagnosis; D001922:Brain Abscess / Q000175:diagnosis* / Q000382:microbiology / Q000601:surgery*; D020863:Central Nervous System Cysts / Q000175:diagnosis* / Q000382:microbiology / Q000601:surgery*; D056364:Colloid Cysts / Q000175:diagnosis; D003937:Diagnosis, Differential; D016972:Enterobacter cloacae / Q000302:isolation & purification; D004756:Enterobacteriaceae Infections / Q000150:complications*; D004814:Epidermal Cyst / Q000175:diagnosis; D005625:Frontal Lobe / Q000382:microbiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008866:Microsurgery; D019635:Neurosurgical Procedures; D012008:Recurrence; D014057:Tomography, X-Ray Computed