Metanephric adenoma are often asymptomatic. Possible symptoms of metanephric adenoma include: 
Hematuria Abdominal distension Abdominal pain
Polycythaemia is a characteristic finding seen in approximately 10% of patients with metanephric adenoma.
What are the historical and symptomatic characteristics of metanephric adenoma?
<|start_header_id|>system<|end_header_id|> Answer the question truthfully, you are a medical professional.<|eot_id|><|start_header_id|>user<|end_header_id|> This is the question: What are the historical and symptomatic characteristics of metanephric adenoma?<|eot_id|><|start_header_id|>assistant<|end_header_id|> Metanephric adenoma are often asymptomatic. Possible symptoms of metanephric adenoma include: 
Hematuria Abdominal distension Abdominal pain
Polycythaemia is a characteristic finding seen in approximately 10% of patients with metanephric adenoma.<|eot_id|>