Giant pseudoaneurysm, left internal maxillary artery

Findings:

Multiple MR and MRA images demonstrate a lobulated left retromaxillary lesion with low signal on T2, internal arterial flow signal on MRA, and pulsation artifacts through the lesion on postcontrast T1 indicating a high flow vascular lesion.

Differential diagnosis:

Aneurysm, pseudoaneurysm, arteriovenous malformation, venous malformation

Discussion:

Spontaneous pseudoaneurysms are rare in the absence of trauma or regional surgery. This lesion was cured with embolization.

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