Paraventricular porencephalic diverticulum with latent hemiparesis as a complication of ventriculography.

The development of paraventricular porencephalic diverticula following ventriculography (Fig. 1 and 2) has been described in children suffering from moderate hydrocephalus (Lorber and Grainger, 1963; Grainger and Lorber, 1963; Lorber and Emery, 1964). The present case illustrates such a lesion existing in an apparently normal child some years after ventriculography. It further illustrates that a latent neurological deficit may be made manifest by the action of sedative drugs. tinued to have occasional fever. On the day of admission he walked normally across the street to his grandparents' house. He spent several hours there and took a short nap. When woken to be taken home he was found to be drowsy and ataxic. The house contained many medicines, including 'heart pills', chlorothiazide, asthma remedies, and tranquillizers, but it was denied that he had had access to these. He became progressively stuporous and was admitted to the hospital.. Significant past history was that the patient had been born in a military hospital where subdural taps and