An unusual intracerebral connective tissue mass.

A sharply circumscribed, vascular, connective tissue mass which replaced the cortex of several adjoining cerebral gyri is described. The histology of the lesion differs from that of previously reported central nervous system maldevelopments and neoplasms. However, there are a number of similarities to the pathology found in late phases of syphilitic "colloid" or "hyaline" degeneration of the brain.