A Follow-up Study on Safety and Tolerability of Intracerebroventricular Administration of sNN0031 to Patients With Parkinson's Disease

Inclusion Criteria: * Previous participation in study sNN0031-001 with completion of 12 study weeks without development of clinically significant safety concerns, defined as being any drug-related or device related serious adverse event that resulted in premature termination of treatment or a medical device incident that could not be resolved during the conduct of study sNN0031-001 * The patient has a diagnosis of idiopathic PD * The patient has been given written and verbal information about the follow-up study, has had the opportunity to ask questions about the study, and understands the time and procedural commitments * The patient has provided written informed consent to participate in the follow-up study Exclusion Criteria: * The patient has been included or participates in another clinical study after participation in Study sNN0031-001 * The patient has, since participation in study sNN0031-001, had functional neurosurgical treatment for PD (e.g., deep brain stimulation). * Patients will only be excluded from participation in the event of a laboratory test abnormality that is indicative of a medical condition requiring treatment which, in the opinion of the investigator, is not compatible with participation in the present study