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Mechanical endonasal DCR procedure. (A) A, frontal process of maxilla; B, nasal mucosal flap elevation. (B) Junction of frontal process maxilla and lacrimal bone (arrow). (C) C, lateral nasal wall; black square, punch on frontal process of maxilla. (D) D, lacrimal sac; arrowhead, nasal septum. (E) E, agar nasi cell; arrow, medial wall lacrimal sac, (F) F, opened lacrimal sac; asterisk, folding back of posterior lacrimal sac flap.
