Carpio et al reported criteria for the diagnosis of extraparenchymal neurocysticercosis. This includes intraventricular and subarachnoid neurocysticerosis. The authors are from multiple institutions in South and Central America, North America and Europe.
Definitive diagnosis - one or more of the following:
(1) extraparenchymal cyst with pathologic diagnosis
(2) MRI special sequence with >= 1 extraparenchymal cyst(s) with >= 1 show a scolex
(3) both of the following
(3a) MRI special sequence with >= 1 extraparenchymal cyst(s) without scolex
(3b) >= 2 of the following
(3b1) hydrocephalus
(3b2) inflammatory CSF
(3b3) positive CSF serology for Taenia
(3b4) one or more calcifications OR parenchymal vesicular/degenerative cyst
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