False Normalization of Ankle Brachial Index: A Case of Lower Extremity Peripheral Arterial Disease with Normal Ankle-Brachial Index

Screening for lower extremity peripheral arterial disease (PAD) is essential in assessing a patient’s risk of cerebrovascular disorders. The ankle-brachial index (ABI) widely used as screening tool PAD, but it can produce falsely normalized results due to factors like artery calcification and collateral vessels. We report patient with normal ABI confirmed PAD through ultrasound computed tomography (CT). This case shows the limitation diagnosis. Additional tests, such CT or ultrasound, should be considered when suspected, even if normal.