Abstract
The etiology and mechanism of expansion of primary intracranial arachnoid cysts have been much debated. A rare case of an 8-month-old boy is reported, in which postnatal development and enlargement of a middle cranial fossa arachnoid cyst was detected on follow-up CT scans. Based on intraoperative and histological findings, the cyst was found to be intra-arachnoid. The wall was excised completely, and the lobe adjacent to the cyst appeared normal apart from signs of atrophy. Histological study of the excised cyst revealed a common arachnoid membrane with neither ependymal nor inflammatory cells; the cyst fluid was similar to CSF. The etiology of the lesion remains unclear, but it was considered that the expansion of the cyst might have occurred through a ball-valve mechanism of the membrane in communication with the general subarachnoid space.
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References
Dyck P, Gruskin P (1977) Supratentorial arachnoid cysts in adults. A discussion of two cases from a pathophysiologic and surgical perspective. Arch Neurol 34:276–279
Galassi E, Piazza G (1980) Arachnoid cysts of the middle cranial fossa: a clinical and radiological study of 25 cases treated surgically. Surg Neurol 14:211–219
Geissinger JD, Kohler WC (1978) Arachnoid cysts of the middle cranial fossa: surgical considerations. Surg Neurol 10:27–33
Ghatak NR, Mushrush GJ (1971) Supratentorial intra-arachnoid cyst. Case report. J Neurosurg 35:477–482
Go KG, Houthoff H-J (1984) Arachnoid cysts of the sylvian fissure. J Neurosurg 60:803–813
Menezes AH, Bell WE (1980) Arachnoid cysts in children. Arch Neurol 37:168–172
Rengachary SS, Watanabe I (1981) Ultrastructure and pathogenesis of intracranial arachnoid cysts. J Neuropathol Exp Neurol 40:61–83
Robinson RG (1955) Intracranial collections of fluid with local bulging of the skull. J Neurosurg 12:345–353
Robinson RG (1971) Congenital cyst of the brain: arachnoid malformation. Prog Neurol Surg 4:133–174
Sato K, Shimoji T (1983) Middle fossa arachnoid cyst: clinical, neurological, and surgical features. Child's Brain 10:301–316
Smith RA, Smith WA (1976) Arachnoid cysts of the middle cranial fossa. Surg Neurol 5:246–252
Starkman SP, Brown TC (1958) Cerebral arachnoid cysts. J Neuropathol Exp Neurol 17:484–500
Williams B, Guthkelch AN (1973) Why do central arachnoid pouches expand? J Neurol Neurosurg Psychiatry 37:1085–1092
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Kumagai, M., Sakai, N., Yamada, H. et al. Postnatal development and enlargement of primary middle cranial fossa arachnoid cyst recognized on repeat CT scans. Child's Nerv Syst 2, 211–215 (1986). https://doi.org/10.1007/BF00706815
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DOI: https://doi.org/10.1007/BF00706815