EEG in subacute sclerosing pan encephalitis (SSPE)

SSPE is a chronic progressive neurodegenerative disorder due to persistent infection by the measles virus.It occurs in children and young adults. It manifests with progressive cognitive decline, myoclonic jerks and ends in a persistent vegetative state.
The EEG is very characteristic with the well known Rademecker complex. This consists of high voltage 300 to 1500uv repetitive polyphasic sharp and slow waves lasting 0.5 to 2 secs and occuring regularly at every 4-15 secs. As the disease progresses the interburst periods may decrease.

Sub arachnoid haemorrhage

Sub arachnoid haemorrhage (SAH) presents as an acute neurological dysfunction.
Non contrast CT is the imaging modality of choice.
CT is positive in 95% in the first 24 hours and pick up rate drops to 50% after a week.
The first 2 pictures are of an acute SAH in the first 24 hours and third picture is after 2 weeks.
SAH appears as high attenuating substance in the normally dark coloured CSF filled sub arachnoid space.
Blood in the anterior interhemispheric fissure suggests ACA aneurysm, in the sylvian fissure suggests MCA aneurysm and post interhemispheric fissure suggest posterior circulation aneurysm.
In children AV malformations are a more common cuse of SAH than aneurysms unlike adults.