Imaging Review of Angiotensin-Converting Enzyme Inhibitor-Induced Angioedema of the Head and Neck.

Angiotensin-converting enzyme inhibitors (ACE-i) are commonly used medications to treat hypertension and congestive heart failure. Angioedema is a well-established side effect of ACE-i and most commonly manifests as swelling of the mucosal and extra-mucosal soft tissues in the head and neck. CT with contrast is generally used to evaluate for airway compromise and to exclude other etiologies of edema. Herein we present five cases that illustrate the radiological findings specific to ACE-i-induced angioedema on enhanced CT scans.