Interest in the subject of cerebellar cysts has been greatly stimulated and the knowledge of them has been brought to the attention of American pathologists chiefly because of the monograph of Lindau,1 which appeared in 1926. The general recognition of the value of this paper has been such that several authors have adopted the designation of "Lindau's disease" to describe the cysts of the cerebellum associated with hemangiomas of the viscera, retina, medulla or cord. Lindau's paper contains a complete survey of 275 cases of cerebellar cysts of various types.
Five cases of brain cyst have been observed post mortem during the course of the last 2,000 consecutive autopsies at St. Luke's Hospital, including only 321 complete examinations of the skull. These probably represent four of the six types recognized in Lindau's classification. The cases may be thus summarized:
—A man, aged 32, admitted to the medical