Came across quite a few medical misnomers during my working life.
There was the man with the "ballistic" kidneys. (polycystic)
The "axillary nurse". (She specialises in armpits)
"Prostrate" glands, "crucial" ligaments, multiple cirrhosis (for those with more than one liver?) and tintinitus (caused by watching too many cartoons?)
And my daughter, then 4, describing the huge jellyfish washed up on the beach as the "one with the very long testicles".