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  • Title: Postnatal development and enlargement of primary middle cranial fossa arachnoid cyst recognized on repeat CT scans.
    Author: Kumagai M, Sakai N, Yamada H, Shinoda J, Nakashima T, Iwama T, Ando T.
    Journal: Childs Nerv Syst; 1986; 2(4):211-5. PubMed ID: 3779685.
    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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