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. 2022 Mar 7;22:87. doi: 10.1186/s12893-022-01539-6

Fig. 1.

Fig. 1

The surgical procedure of STA-MCA bypass. A The frontal and parietal branches of the STA were separated. B The parietal branch (donor vessel) was stained by methylene blue. C The M4 segment of the MCA (recipient vessel) was blocked by two temporary aneurysm clips and the vessel wall was cut. D The donor and recipient vessels were anastomosed end to side. E and F Each side of the vessels was sutured with 3–4 needles. G One aneurysm clip was released and there was no bleeding at the anastomotic site. H The blood reflux of frontal branch was well