I have had a painful mass in my right ankle for the past few months. i saw a gp last year, and he sent me for a sonar, the results were vascular structures in area? varicose veins or av malformation. i have no idea what this means?

Previous injury: I would need more info did you previously injure yourself? It could be do to a hematoma secondary to trauma. If not then if it does not reduce in size soon then you should see a Podiatrist and maybe have a biopsy or a MRI

Painful mass ankle: I would recommend that you seek evaluation by a vascular surgeon to help in differentiating these 2 different issues. Management would depend upon the underlying issue, oftentimes AV malformations can be sealed by using interventional radiology techniques.