Fig 4.

Representative histologic findings after periprocedural hemorrhage.

A, Patient 8. Section shows massive iron deposition (blue) indicating previous intratumoral hemorrhage (solid arrows) around acute hemorrhage (brown, dotted arrows) (hematoxylin-eosin and Prussian blue, original magnification ×8).

B and C, Patient 11. Pathologic vessels with variable wall thickness were seen in four of five patients (B, hematoxylin-eosin, original magnification ×20). In some areas, the wall is atypically thin relative to the lumen (arrows in B). These vessels were positive for actin, indicating arteries (C, original magnification ×50). Similar vessels, also filled with particles, were seen in other patients with hemorrhage.