Chronic Venous Insufficiency (CVI): Given the patient's age and symptoms of leg swelling and tingling, CVI is a common condition that could explain these symptoms. The normal heart function shown on the echo reduces the likelihood of heart failure as a cause of the swelling.

Peripheral Artery Disease (PAD): This condition could cause leg swelling and tingling due to reduced blood flow to the legs. The patient's age increases the risk for PAD.
Deep Vein Thrombosis (DVT): Although the swelling is described as not resolved, which might suggest a chronic condition, DVT should be considered, especially if there's a history of immobility or other risk factors.
Diabetic Neuropathy: If the patient has diabetes, neuropathy could cause tingling in the legs. However, this would not directly explain the swelling unless there's associated poor circulation.

Abdominal Aortic Aneurysm (AAA): Although less likely to cause isolated leg swelling and tingling, AAA is a potentially life-threatening condition that could lead to severe consequences if missed. It's more common in older males.
Lymphoma or Other Malignancies: Certain cancers can cause leg swelling due to obstruction of lymphatic or venous return. This is less common but critical not to miss.
Heart Failure: Despite the recent normal echo, heart failure can have a variable course, and new onset or worsening of symptoms could indicate a change in cardiac function.

Amyloidosis: A group of diseases that can cause neuropathy and potentially swelling due to cardiac or renal involvement, though this would be less common and typically associated with other systemic symptoms.
Fabry Disease: A genetic disorder that can cause neuropathic pain and potentially swelling, though it's very rare and usually presents with a broader range of systemic symptoms.
Chronic Compartment Syndrome: This could cause leg swelling and tingling, especially after activity, but it's less common in the context provided and typically associated with pain during exercise.