Name of Journal: Clinical Case ReportsManuscript Type: CASE REPORTGiant maxillary sinus cyst removal with simultaneous external maxillary sinus elevation and implant placement: a case reportYunpeng Bai 1,*, Jingjing Sha 2, Hong yang 1, Yiting Cai 1, Xin Peng3, Haipeng Sun 1,*.1 Department of prosthodontics and implantology, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China; Y.B., xyywq@126.com; H.Y., 2459011165@qq.com; Y.C., 18126457822@163.com; H.S., shplysz@126.com.2 Department of endodontics, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China; J.S., shajingjingabcd@163.com.3 Department of implantology, Southwest Stomatology Hospital, Chengdu, China; X.P., 501185017@qq.com.Author contributions: Bai YP contributed to the conceptualization and visualization of the manuscript; Bai YP and Peng X operated the sinus augmentation and implantation surgery; Bai YP, Sha JJ, and Sun HP involved in the funding acquisition, original draft writing; Bai YP, Yang H, Cai YT investigated; Bai YP, Sha JJ, Yang H, Cai YT contributed to the methodology of the manuscript; Bai YP and Sha JJ contributed to the supervision, writing-review and editing of this manuscript; and all authors have read and agreed to the published version of the manuscript.Funding: This research was funded by Shenzhen Science and Technology Program, grant number JCYJ20220530165409022.Corresponding author: Haipeng Sun, PhD, Chief Doctor, Department of prosthodontics and implantology, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China, shplysz@126.com; Yunpeng Bai, PhD, Attending Doctor, Department of prosthodontics and implantology, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China, xyywq@126.com.