Q27.34

Clinical Causes: Congenital development: Some renal AVMs are present at birth due to abnormal vascular formation during fetal development. Acquired factors: Trauma, surgical procedures, or infections affecting the kidneys may lead to the formation of AVMs over time. Unknown origins: In many cases, the precise cause remains unidentified, especially in idiopathic cases.

Key Symptoms: Hematuria: Presence of blood in the urine, which may be visible or microscopic. Flank pain: Discomfort or pain located in the side of the abdomen, near the affected kidney. High blood pressure: Elevated blood pressure may result from abnormal blood flow dynamics. Palpable mass: In some cases, a noticeable lump can be felt during physical examination. Symptoms of bleeding: Sudden, severe bleeding can lead to signs like lightheadedness or shock in extreme cases.

Diagnosis Path: Diagnosing a renal AVM involves several imaging tests to visualize the abnormal blood vessels. Common approaches include: - Ultrasound: May reveal abnormal blood flow or a mass. - Computed Tomography (CT) Angiography: Provides detailed images of vascular structures. - Magnetic Resonance (MRI) Angiography: Offers high-resolution images without radiation exposure. - Digital Subtraction Angiography (DSA): The most definitive test, allowing direct visualization and potential treatment options during the procedure.

Treatment Protocols: Management of renal arteriovenous malformations depends on factors such as size, location, symptoms, and risk of complications. Treatment options may include: - Observation: Small, asymptomatic AVMs may be monitored regularly. - Endovascular embolization: A minimally invasive procedure that blocks abnormal vessels using coils or other materials. - Surgical intervention: In cases where embolization is unsuccessful or not feasible, partial or complete nephrectomy (removal of the affected kidney) may be considered. - Supportive care: Managing symptoms like bleeding or hypertension through medication or supportive therapies.