Patients with<unk>  exhibit myoclonic jerks and tonic-clonic seizures at a young age, between ages 6–16. The myoclonic jerks occur in the muscles of the arms and legs closest to the torso, and are triggered due to a variety of common external stimuli. Seizures begin at an average age of 10.8 years, with myoclonus beginning around 12.1 years. It is not currently possible to diagnose without a genetic test, and since early symptoms are general, it is often mistaken for another more common epilepsy, in many cases juvenile myoclonic epilepsy (JME).
Unverricht–Lundborg disease
Brill–Zinsser disease
Cruveilhier–Baumgarten disease
Letterer–Siwe disease
Paget–Schroetter disease
Tornwaldt's disease
Fox–Fordyce disease
Urbach–Wiethe disease