PMC4828951_01
Pre- and intra-operative superficial temporal artery aneurysm imaging and figure. (a) Three-dimensional computed tomography angiogram showing an aneurysm on the main trunk of the superficial temporal artery and the preauricular region on the zygomatic arch. (b) Intraoperative photograph showing the superficial temporal artery aneurysm. There is a small distance between the feeding and the draining artery. (c) Lateral view of the cranial and superficial temporal artery schema showing that the main trunk of the superficial temporal artery crosses the zygomatic arch in the preauricular region, the site where the spontaneous superficial temporal artery pseudoaneurysm developed (arrow). The superficial temporal artery passes over the linea temporalis (white arrowhead) and includes its tip (black arrowhead)
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F1
Three-dimensional computed tomography angiography showed a well-enhancing saccular aneurysm on the main trunk of the STA [Figure 1a]. There was a small distance between the feeding and draining vessels [Figure 1b].
Histological features. (a) Low magnification of the lesion showing saccular dilation of the artery. The remnant of the internal elastic lamina is seen on the left (arrowheads). Victoria blue - H and E staining. (b) High magnification of the aneurysmal wall (encased by a rectangle in Figure 2a). Fibroblast proliferation and loose connective tissue are observed, and the normal arterial wall structure is lost (Victoria blue - H and E, x100. (c) The arterial wall in the vicinity of the aneurysm shows intimal thickening and calcification in the media (H and E, x20)
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A cross-section of the aneurysm [Figure 2a] showed marked dilation of the artery. At the site of the aneurysm, the normal arterial wall structure was replaced by fibroblast proliferation and loose connective tissue [Figure 2b]; in the vicinity of the aneurysm, we observed atherosclerosis with intimal thickening and calcification in the media [Figure 2c].