Diagnosis: Posttraumatic pseudoaneurysm of the right sphenopalatine artery
Posttraumatic pseudoaneurysms of the sphenopalatine artery are rare. To our knowledge, this is the second case reported in the literature.1There are 3 reported cases of iatrogenic sphenopalatine pseudoaneurysms that occurred after Le Fort I osteotomies2,3and 1 case that was secondary to mucormycosis.4The main difference between a pseudoaneurysm and a true aneurysm is that the pseudoaneurysm forms as the hematoma, in continuity with the breached arterial lumen, initiates a surrounding inflammatory reaction, forming a pseudocapsule, in contrast to true aneurysms, which have an endothelial lining.
Radiology Quiz Case 2: Diagnosis. Arch Otolaryngol Head Neck Surg. 2010;136(5):520-521. doi:10.1001/archoto.2010.61-b