Nasopharyngeal angiofibroma
Small and large vessels of various shapes and fibrous stroma are present in angiofibroma (left). Single layer of thin endothelial
cells line these vessels. Moreover, elastic fibers and smooth muscle are absent in these vessels. The branches of external carotid
artery typically provide the blood supply to these vessels. The fibrous stroma is better depicted in trichrome-stained tissue (right).
1 minute clinical correlation