Ill-defined hypo-density predominantly affecting the sub cortical white matter of the right posterior frontal lobe. Mildly effaced adjacent cortical sulci; otherwise, no gross mass effect, hydrocephalus or mid line shift is seen. No calcifications or hemorrhage is seen in the lesion. Conclusion: Ill-defined sub cortical white matter hypo-density in the right posterior frontal lobe. Possible differential diagnosis includes encephalitis & venous infarction; however, the possibility of a space occupying lesion also cannot be excluded.