title: The MRI signs of spinal arachnoid diverticula.
abstract: Our goal was to find MRI signs of use for identifying a spinal arachnoid diverticulum. Three cases of spinal arachnoid diverticula, one extradural and two intradural, were examined on a 1.5 T imager. There was obvious mass effect on the adjacent structures in one case and increased signal intensity in the diverticulum on proton density- and T2-weighted images in two cases. Signal changes due to turbulent movement of the spinal fluid inside the diverticula were seen in all cases on sagittal fast spin-echo (FSE) proton density- and T2-weighted images; it was difficult to tell whether these signal changes imply a communication or are simply FSE artefacts. On contrast-enhanced studies, all cases showed partial enhancement inside the diverticula. There thus are four signs of diverticula: mass effect, the increased signal, signal void sign and partial enhancement; the last of these, the most reliable, has never been reported before.
authors.affiliation: Department of Radiology, Chang Gung Memorial Hospital, Taipei, Taiwan.
authors.forename: C J
authors.initials: CJ
authors.lastname: Chen
authors.forename: L S
authors.initials: LS
authors.lastname: Ro
mesh_terms: D000328:Adult; D001099:Arachnoid / Q000473:pathology*; D002555:Cerebrospinal Fluid / Q000502:physiology; D004240:Diverticulum / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009103:Multiple Sclerosis / Q000175:diagnosis; D009460:Neurologic Examination; D013116:Spinal Cord / Q000473:pathology; D013117:Spinal Cord Compression / Q000175:diagnosis