Immediately after an episode of infection, a six-year-old boy develope
d quadriplegia and loss of speech with normal consciousness and vertic
al ocular mobility. These features established the diagnosis of locked
-in syndrome. Cerebral computed tomography disclosed ischemic lesions
in the optical layer and foot of the left cerebral peduncle. Locked-in
syndrome is usually due to a lesion in the ventral part of the pens.
The most common cause is thrombosis of the basilary artery. The progno
sis is grim.