TOHO UNIVERSITY IMAGE: (A) THE FRONTAL PROCESSES OF THE MAXILLA AND THE LACRIMAL BONE ARE REMOVED TO EXPOSE THE NASOLACRIMAL DUCT AND THE LACRIMAL SAC. (B) THE MUCOUS NASOLACRIMAL DUCT AND THE LACRIMAL SAC ARE ELEVATED FROM THE BONY NASOLACRIMAL CANAL AND THE ORBITAL PERIOSTEUM. THE NASOLACRIMAL DUCT IS THEN SEVERED AT THE LOWER END....