The illnesses were rare, strange, complex, and often genetic: hydrocephalic children, children with cerebral palsy, missing kidneys, extra fingers, anemia, fatigue, and weak immune systems.

There’s much talk these days about the speed of the modern game, thanks to the new titanium rackets, pencil-light with all but rimless hydrocephalic heads.

As for Swinburne's hydrocephalic muse, I do not think Whitman took any interest in it from the first.