Conversation: The conversation between human and AI assistant.
[|Human|] hi, two years ago I started having hand tremor, fatigue, difficulty swallowing, muscle tightness of upper extremities. then, a neurologist suggested could be PD? when given Dopamine, my symptoms were less severe. My DatScan just came back negative. Do you think I can have PD without the DatScan confirmation?
[|AI|]  Hi, Parkinsonism has a very large number of causes but no laboratory or imaging study is required in patients with a typical presentation. Such patients are aged 55 years or older and have slowly progressive and asymmetric parkinsonism with resting tremor and bradykinesia or rigidity. Now, it depends on the long-term course of your illness. If these symptoms remain persistent, and the many causes of parkinsonism are ruled out, Parkinson's is the diagnosis.  Hope I have answered your query. Let me know if I can assist you further.