Is hemiplegia caused by a porencyphic cyst a type of cerebral palsy?

No: Porencephalic areas of a brain are where brain tissue has been destroyed by a stroke or hemorrhage or injury are not the same as cerebral palsy. They are distinct entities and not associated with each other.

Both from same : Cause. "cp" is a group of chronic motor impairments defined by functional limitations in mobility & hand use associated with neurological dysfunction, not by underlying cause.Impaired control of movement & posture appears early in life, usually from prenatal brain malformation or injury. Spastic hemiplegia, a type of cp, is one-sided increased muscle tone & decreased voluntary movement.

Result not cause: Hemiplegic cerebral palsy is a defect in muscle control that affects only one side of the body. This is often caused by a stroke that damaged the fetal brain in utero. The stroke will leave a region of damaged brain that eventually becomes a porencephalic cyst. The stroke that resulted in the cerebral palsy may never be determined as to cause.

Yes: A porencephalic cyst can be a cause of hemiplegic cerebral palsy. A porencephalic cyst is really an imaging finding but itself may have been caused by something that injured the brain prenatal KY such as a stroke, trauma, infection, etc.