AIM: To get the CT measurement values oflacrimal fossa, analyze the impact of age, gender factors on it, and provide a reference for relevant clinical work.

METHODS: Totally 100 cases were scanned by 64-slice spiral CT volume. The data of lacrimal fossa was measured and analyzed.

RESULTS:The average length oflacrimal fossa was(12.28±2.68)mm, average depth was(6.56±1.06)mm. The medial wall of the lacrimal fossa and nasal midline sagittal were almost parallel. When the subjects were grouped by gender, the lacrimal fossa of male was a little longer and wider than female's; when the subjects were grouped by age, the data of aged group was bigger than young group's.

CONCLUSION: Before orbital wall fracture repair surgery or endoscopic nasal dacryocyst made holes surgery, we should first check with 64-slice spiral CT to make clear the lacrimal fossa bone of different types construction, to forecast the potential problems during surgery, and how to prevent surgical complications.