Idiopathic means: Unknown cause: Idiopathic. Idiopathic may also be used to describe any disease of unknown or uncertain origin. Acute idiopathic Polyneuritis is an example.
Diffuse idiopathicskeletal hyperostosis.
Idiopathic pulmonary Fibrosis
idiopathic scoliosis, etc.
(in Medical Dictionary)

What else does Idiopathic mean?

The New Latin idiopathia primary illness, from the Greek, idiopatheia.
(in Medical Dictionary)

A disease without a known cause.
(in Merlin Dictionary)