Viene descritto il caso di un paziente di 46 anni portatore di una cisti meningea toracica extradurale. L'iter neuroradiologico si è basato anzitutto sulla risonanza magnetica che ha identificato e localizzato la massa cistica a livello D8. La comunicazione con lo spazio subaracnoideo è stata dimostrata dalla mielo-TC, consentendo una agevole diagnosi di cisti meningea. L'intervento ha portato all'isolamento e all'esclusione della cisti mediante clip posta sul colletto. La sintomatologia essenzialmente algica è quindi del tutto regredita. Le cisti meningee extradurali sono lesioni rare, la cui frequenza è forse sottostimata in quanto variamente denominate in letteratura. Questo caso ha offerto l'opportunità di rilevare come la loro classificazione sia fonte di imprecisioni e confusione. Viene quindi proposto un criterio pratico per inquadrarle.
CombellesGRousseauxM: Kystes méningés extra-duraux rachidiens. A propos de 4 cas. Neurochirurgie29: 13–19, 1983.
7.
CuneoHM: Spinal extradural cysts. Report of a case. J Neurosurg12: 176–180, 1955.
8.
DavisCHJr: Spinal extradural cyst. Case report and tabulation of previously reported cases. J Neurosurg6: 251–254, 1949.
9.
Di SclafaniACanaleDJ: Communicating spinal arachnoid cysts: Diagnosis by delayed metrizamide computed tomography. Surg Neurol23: 428–430, 1985.
10.
ElsbergDADykeOGBrewerED: The simptoms and diagnosis of extradural cysts. Bull Neurol Inst N Y3: 395–417, 1934.
11.
FortunaALa TorreECiappettaP: Arachnoid diverticula: A unitary approach to spinal cysts communicating with the subarachnoid space. Acta Neurochir (Wien)39: 259–268, 1977.
GarcinRLaunayC: Compression médullaire par kyste spinal extradural congenital chez un enfant de six ans, opération, guérison, mais développement ultérieur d'une cyphose. Rev Neurol98: 54–61, 1958.
14.
GlasauerFE: Lumbar extradural cyst. Case report. J Neurosurg25: 567–570, 1966.
15.
GoodCAAdsonAWAbbottKH: Spinal extradural cyst (diverticulum of spinal arachnoid). Report of a case. AJR52: 53–56, 1944.
16.
GortvaiP: Extradural cysts of the spinal canal. J Neurol Neurosurg Psychiat26: 223–230, 1963.
HeithoffKB: Computed tomography assessment of the postoperative spine. In: Spine update 1984. GenantHK. (Ed) San Francisco1983: 243.
19.
KellyTSB: Non-parasitic extradural cyst of the spinal canal. Lancet2: 13–16, 1937.
20.
KimKSWeinbergPE: Magnetic resonance imaging of a spinal extradural arachnoid cyst. Surg Neurol26: 249–252, 1986.
21.
LehmanEP: Spinal extradural cysts. Am J Surg28: 307–322, 1935.
22.
MallJCKaiserJA: Computed tomography of the postoperative spine. In: Computed tomography of the lumbar spine. GenantHKChafetzNIHelmsCA, (Eds), Dep of Radiology, UCSF, 1982.
23.
McCrumCWilliamsB: Spinal extradural arachnoid pouches. Report of two cases. J Neurosurg57: 849–852, 1982.
24.
NaborsMWPaitG: Updated assessment and current classification of spinal meningeal cysts. J Neurosurg68: 366–377, 1988.
25.
NaidichTPMcLoneDGHarwood-NashDC: Arachnoid cysts, paravertebral meningoceles, and perineural cysts. In: NewtonTHPottsDG, (Eds): Computed tomography of the spine and spinal cord. Clavadel Press, San Anselmo, 1983: 383–396.
RexedB: Arachnoidal proliferations with cyst formation in human spinal nerve roots at their entry into the intervertebral foramina. Preliminary report. J Neurosurg4: 414–421, 1947.
33.
SachdevVPHuangYP: Posttraumatic pseudomenin-gomyelocele (enlarging fracture?) in a vertebral body. J Neurosurg54: 545–549, 1981.
34.
SchmidtA: Cyste der dura mater spinalis, einen extraduralen Tumor vortauschend. Deutsch Z Nervenheilk26: 318–323, 1904.
TeplickJGTeplickSKHaskinME: The postoperative lumbar spine. In Computed tomography of the spine, PostMJD, (Ed), Williams e Wilkins. Baltimore1984: 406.
41.
AgustinJJ TeruelMartinenchE Gomez: Computed tomography of a post traumatic spinal arachnoid cyst. Neuroradiology31: 354–355, 1989.
42.
VonofakosDGrauHSteudelW: Multiple spinal arachnoid cysts: The role of oily contrast medium. Surg Neurol15:125–127, 1981.
