Intracranial germ cell tumor is more common in Asian countries, including Japan, than in Western countries. The disease is characterized by juvenile onset with a mean age at diagnosis of 18 years. Most patients with intracranial germ cell tumors in the basal ganglia manifest paralytic symptoms, but few of these patients have been reported to have long-term progression of motor paralysis and rehabilitation interventions.A young male patient was diagnosed as having right basal ganglia germinoma and left hemiplegia at the age of 10 years. He received intervention and long-term follow-up for upper limb function. He underwent hybrid assistive neuromuscular dynamic stimulation therapy at the age of 14 years and modified constraint-induced movement therapy (modified CI therapy) at the age of 20 years. With such a gradual neurorehabilitation intervention, the Fugl-Meyer assessment score for the upper limb improved from 41 to 58 points, and the frequency of use of the paralyzed hand also improved. We hope that this report will provide guidance when considering treatment options for similar diseases in the future.

Intracranial germ cell tumor is more common in Asian countries, including Japan, than in Western countries. The disease is characterized by juvenile onset with a mean age at diagnosis of 18 years. Most patients with intracranial germ cell tumors in the basal ganglia manifest paralytic symptoms, but few of these patients have been reported to have long-term progression of motor paralysis and rehabilitation interventions.A young male patient was diagnosed as having right basal ganglia germinoma and left hemiplegia at the age of 10 years. He received intervention and long-term follow-up for upper limb function. He underwent hybrid assistive neuromuscular dynamic stimulation therapy at the age of 14 years and modified constraint-induced movement therapy (modified CI therapy) at the age of 20 years. With such a gradual neurorehabilitation intervention, the Fugl-Meyer assessment score for the upper limb improved from 41 to 58 points, and the frequency of use of the paralyzed hand also improved. We hope that this report will provide guidance when considering treatment options for similar diseases in the future.