Sectional anatomical observation of coronal plane of dacryocystorhinostomy related structures

: Objective:To study coronal plane of dacryocystorhinostomy related structures for clinical practice. Method:Extracted images concluding lacrimal sac and nasolacrimal canal information from head coronal sectional imaging data-set we created.Observed shape and location of the left lacrimal sac,nasolacrimal canal, and surrounding structures.Measured details of the important portion.Result:Images of different layer show the shape and locative relationship of the lacrimal sac, nasolacrimal canal, and surrounding structures precisely.The thinnest thickness of medial wall and lateral wall of the lacrimal sac is 1.2mm and 0.6mm. There is a 2.3mm high longitudinal fold on the lateral wall.The thickness of medial wall and lateral wall of membranous nasolacrimal canal is(1.97±0.47)mm and(1.52±0.17)mm.Transverse diameter of membranous nasolacrimal canal is(1.78±0.12)mm. The thinnest thickness of medial wall and lateral wall of bony nasolacrimal canal is 0.30mm and 0.15mm.Transverse diameter of bony nasolacrimal canal is(5.50±0.12)mm.The proportion of cross-membranous nasolacrimal canal sectional area in bony nasolacrimal canal sectional area is(13.5±2.9)%.Conclusion: Head coronal sectional imaging data-set with high precision can be used for sectional anatomical study of the lacrimal sac, nasolacrimal canal and surrounding structures and measurement of details.