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Real-time ultrasonography: a useful tool in the evaluation of the craniectomized, brain-injured patient.

Real-time ultrasonography is being used increasingly to establish the diagnosis of and serially assess intraventricular hemorrhage and hydrocephalus in neonates. The procedure requires an open fontanel because scatter from the bone occurs from direct application of the transducer to the skull and bone density precludes satisfactory imaging. With an adult, under circumstances where a bone flap is left out after intracranial procedures and the patient's clinical status is such that the patient cannot be transferred for computed tomographic scanning, real-time ultrasonography allows a safe, noninvasive, bedside demonstration of ventricular size, degree of shift of midline structures, and intraparenchymal and intraventricular lesions.