Segmental Arterial Mediolysis: A Multiguised Vasospastic Arteriopathy with Collateral Mesangial Cell Hyperplasia and Cardiac Toxicity Generated by Norepinephrine and Hyperdense Adrenoceptors Alone or by Crosstalk with Other Pressor Agents

Figure 26

Vertebral artery dissection. The black arrow points to a gap aneurysm and the blue arrow to a beginning dissection. Hematoxylin & eosin ×25.