Athetosis SNOMEDCT_US:58593005 Involuntary writhing movements Athetosis derives from the Greek word for 'changeable' or 'unfixed'. UMLS:C1845265 UMLS:C0004158 HP:0002305 SNOMEDCT_US:44913001 Involuntary writhing movements in fingers, hands, toes, and feet Athetoid movements HP:0007316 A slow, continuous, involuntary writhing movement that prevents maintenance of a stable posture. Athetosis involves continuous smooth movements that appear random and are not composed of recognizable sub-movements or movement fragments. In contrast to chorea, in athetosis, the same regions of the body are repeatedly involved. Athetosis may worsen with attempts at movement of posture, but athetosis can also occur at rest. HP:0007167 Involuntary movements