Symmetric bithalamic and striatal hemorrhage following perinatal hypoxia in a term infant.

A full-term infant who demonstrated a prolonged period of obtundation following asphyxia at birth was found on cranial computed tomography (CT) to have hemorrhage limited exclusively to symmetric bithalamic and striatal areas. This pattern of discrete, symmetric nuclear hemorrhage has not so far been reported as a complication of birth asphyxia. It differs from the germinal matrix hemorrhage on one hand in having a later time of onset (between the 4th and 10th day of life). It is also distinct from the more common supratentorial parenchymal hemorrhages in full-term infants owing to its topography, consequent interruption of the thalamocortical arousal mechanisms, and prolonged period of obtundation.