case_images: PMC8588750_01
case_images: (A) Axial cross section on cardiac CTA showing the well circumscribed mass (red arrow) anterior to the right atrial appendage and adjacent to the pericardium. (B) A 3-dimensional reconstructed CT image of the mass with arterial supply from the right internal mammary artery (yellow arrow). (C, D) CMR images show the mass with significant first-pass perfusion and late gadolinium enhancement consistent with a highly vascularized structure.
case_images: mdcvj-17-3-516-g1.jpg
case_images: PMC8588750_01_mdcvj-17-3-516-g1.jpg
case_images: F1
case_images: He had a contrast chest CT that did not show pulmonary emboli but demonstrated a 3 x 2 cm anterior mediastinal mass adjacent to the pericardium (Figure 1). These findings are consistent with a highly vascular structure. There was no evidence of tissue invasion (Figure 1). Due to concerns for an arteriovenous malformation (AVM), he underwent CTA with 0.5-mm sequential cuts, which demonstrated a large 4 x 2.5 cm AVM in the anterior mediastinum that was supplied by branches off the right internal mammary artery and the left internal thoracic vein arising from the left brachiocephalic vein (Figure 1).