[Unilateral hemimegalencephaly and hemiatrophy of brain: principles of computer tomographic differentiation]

Unilateral hemimegalencephaly (UHE) and hemiatrophy (HA) of brain are two pathological states of brain completely different in their nature. Nevertheless, neuroimaging examinations revealed pronounced asymmetry of hemispheres in both cases. This dictates a nesessity of both elaboration and wide usage of definife objective criteria for differentiation of the alterations above by means of either computer tomography or magneto-resonance tomography. Differential diagnostic criteria for UHE and HA are proposed.