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., [email protected]; H.Y., [email protected]; Y.C., [email protected]; H.S., [email protected] Department of endodontics, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China; J.S., [email protected] Department of implantology, Southwest Stomatology Hospital, Chengdu, China; X.P., [email protected] 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, [email protected]; Yunpeng Bai, PhD, Attending Doctor, Department of prosthodontics and implantology, Shenzhen University Affiliated Shenzhen Stomatology Hospital, Shenzhen, China, [email protected].