Dandy and the pediatrician Blackfan published two papers on the production, circulation, and absorption of CSF in the brain and on the causes and potential treatments of hydrocephalus. Hydrocephalus is the buildup of CSF within the brain, an often lethal condition if left untreated. They described two forms of hydrocephalus, namely "obstructive" and "communicating," thus establishing a theoretical framework for the rational treatment of this condition. 

Dandy was responsible for the introduction of ventriculography.

Introduction of pneumoencephalography.

Intracranial section for glossopharyngeal neuralgia. For a more detailed account see his paper in Arch. Surg. (Chicago), 1929, 18, 687-734.

Dandy’s operation for relief of Menière’s syndrome.

Dandy was the first surgeon to directly clip an intracranial aneurysm.

Volume XII in Lewis' Practice of Surgery.