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(FRAME-INFO (STRING "Porencephaly. \(Image compliments of Drs. E.C. Alvord, Jr., and  A.M. Spence, Dept. of Pathology, University of Washington\). Lateral view of the right cerebral hemisphere. If, during development, circulation and resorption of cerebral spinal fluid is blocked, then the brain swells, white matter is deficient and development does not progress normally.  This case is probably the result of a middle cerebral arterial insufficiency in utero. Porencephaly is usually bilateral, and as in this case, the hole leads down into the lateral ventricle. The patient would have been severely quadriplegic because the central \"sensorimotor\" cortex  \(one side shown\) is involved. "))