Shanghai Auditory Medical Center 1 article published in JoVE Medicine Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique Zhen Gao*1,2,3, Xian-Hao Jia*1,2,3, Ya-Sheng Yuan1,2,3 1Department of Otology and Skull Base Surgery, Eye & ENT Hospital, Fudan University, 2Shanghai Auditory Medical Center, 3NHC Key Laboratory of Hearing Medicine (Fudan University) In this paper, we present the protocol and short-term outcomes of endaural exclusive endoscopic atticoantrotomy using a constant suction bone-drilling technique.