Juvenile myoclonic epilepsy

Juvenile myoclonic epilepsy, also known as Janz syndrome, is an idiopathic generalized epilepsy. Of genetic origin, it usually begins between 12 and 18 years of age.

Myoclonias are the main manifestation and consist of abrupt, brief, involuntary contractions of the upper extremities, and sometimes also of the lower extremities. They usually occur during the morning after waking up. Generalized tonic-clonic seizures and sometimes absences are frequent.