Unresponsive brain - MRI

[spmed]

Hi,

My close relative (uncle - 63 yrs old) had recently undergone collar-bone plate-removal operation, during which time, something happened because of which the supply of oxygen to brain stopped all of a sudden and he became unresponsive and has been in unconscious state since then (more than 3 weeks now). He was in ventilator for 12 days and has been in ICU since then. Rest of the body is functioning in a normal manner.

He seldom reacts to pinching, and eyes open momentarily during physiotherapy.

His recent MRI report says:

'An ill-defined fairly symmetrical hyperintensity in bilateral high fronto-parietal white matter and in the posterior limb of internal capsule on Diffusion wtd. images with lowering of ADC values, most probably of a Hypoxic - Ischemic etiology.

A small ill-defined focal area of restricted in the midline corpus callosum splenium, probably post-ictal.

A hypoplastic A1 segment of left ACA (Normal variant), a focal area of mild narrowing in the proximal segment of right PCA & a focal area of mild (<30%) narrowing at bilateral ICA origin appreciated on MR Angiography source images with normal flow distally.

Mild mucosal thickening is seen in the ethmoid, sphenoid and maxillay sinuses.

Rest of the brain parenchyma do not reveal any signal abnormality."

What does this mean? And how long does this unconsciousness state take before regaining consciousness?

Thanks