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  Indian J Med Microbiol
 

Figure 1 :(a) Classic tree-barking, multiple gelatinous plaques, separated by stellate scars and vertical furrows, seen in the ascending aorta and arch. Note that some plaques are yellow due to superimposed atherosclerosis; (b) Chronic mesoaortitis, where part of the media is replaced by fibrous scars; (c) The adventitia shows endarteritis of the vasa vasorum (Elastic van Gieson, ×250). The arrow points at the perivascular inflammatory infiltrate rich in plasma cells. (Elastic van Gieson, ×250)

Figure 1 :(a) Classic tree-barking, multiple gelatinous plaques, separated by stellate scars and vertical furrows, seen in the ascending aorta and arch. Note that some plaques are yellow due to superimposed atherosclerosis; (b) Chronic mesoaortitis, where part of the media is replaced by fibrous scars; (c) The adventitia shows endarteritis of the vasa vasorum (Elastic van Gieson, ×250). The arrow points at the perivascular inflammatory infiltrate rich in plasma cells. (Elastic van Gieson, ×250)