PMC4802987_01
Preoperative magnetic resonance image in coronal and axial view showing a lesion in proximal third of the right ulnar artery (a and b). It is possible to see the relationship with the right ulnar nerve (b). The Angiography showed a pseudoaneurysm in proximal third of the right ulnar artery (c and d)
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F1
The lesion measured about 28 mm [Figure 1c and d].
In hematoxilina and eosina and original magnification, x40, in the background, the wall of the pseudoaneurysm presented the lymphoid and eosinophilic infiltrate (a); the lymphoid infiltrate showed both a diffuse and a nodular pattern, with formation of follicles with prominent germinal centers (b); the endothelial cells often showed plump or "hobnail" appearance, eosinophilic cytoplasm, and round nuclei with granular chromatin (c)
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F2
The histopathological diagnosis deposed for ALHE since the vessel wall was characterized by a lymphoid and eosinophilic infiltrate, as well as by plump or "hobnail-like" endothelial cells [Figure 2].
Postoperative angiography showed complete removal of the pseudoaneurysm (a and b)
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F3