Magnetic resonance imaging of the head showed a thickened calvarium, as well as a 2 cm supracerebellar
arachnoid cyst and a lipoma at the corpus callosum as incidental findings.
Contraindications to lumbar puncture [7-9] * Major contraindication is raised intracranial pressure * Focal neurological deficit * Papilloedema * Significantly altered level of consciousness * Computed tomography (CT) findings * lateral midline shift * loss of suprachiasmatic or basal cisterns * fourth ventricle effacement * obliteration of supracerebellar
or quadrigeminal plate cisterns with patent ambient cisterns * Presence of local infection at lumbar puncture site * Coagulopathy * Thrombocytopenia (platelet count <50 000)
(6) Intracranial arachnoid cysts are most commonly found in the middle cranial fossa (50% to 60%), the parasellar region (10% to 15%), the quadrigeminal plate cisterns (10%), the cerebellopontine angle (5% to 10%), the supracerebellar
cistern (5%), and the cisterna magna (5%).
In addition, endoscopic supracerebellar
transtentorial approaches to the medial posterior temporal lobe are a possibility .