see 1927 - 1929
The pineal region is a exceptional intracranial epidermoid cyst. Harvey Williams Cushing was the first to report the pineal localization of the epidermoid cyst in 1928.
In 1928, Cushing and Bailey classified cavernous malformations as a solid subtype of hemangioblastomas
They distinguished meningothelial, fibroblastic, and angiomatous subtypes, and to this day allocation to subtype is based solely on histological findings.
Cushing H, Bailey P (1928) Tumors arising from the blood-vessels of the brain. Charles C. Thomas, Springfield.
Penfield W. An Address on the Field of Neurosurgery. Can Med Assoc J. 1928
Dec;19(6):654-5. PubMed PMID: 20317113; PubMed Central PMCID: PMC1710184