Objective:To improve the diagnostic level of lower extremity deep venous thrombosis ( LEDVT ) and decrease the rate of missed diagnosis.Methods:23 clinical cases which admitting diagnosed with LEDVT but final diagnoses weren't LEDVT were retrospectively analyzed in our hospital between 2000 and 2006.Results:Of these 23 cases with missed diagnosed,13 cases were gynecology tumor,1 case was adenomyosis,3 cases were rectal cancer,2 cases were lung cancer,2 cases were carcinoma of bladder,1 case was prostatic carcinoma,and 1 case was malignant lymphoma in ingina.Conclusion:clinicians should pay attention to question the case history when their patients get lower extremity deep venous thrombosis,especially to those whom are inconspicuous predisposing cause.

Surgical science is one of the chief courses in medical college.The teaching quality of clinical practice has a great influence on the trainees whether they can become qualified doctors as quickly as they can.This paper discusses mainly how to develop the students' scientific clinical thinking ability,enhance basic operating skills and deal with the relationship between doctors and patients.

MOOCs (massive open online courses) is a new curriculum model and teaching form emerging in recent years in the field of education. The characteristics and advantages of MOOCs can make up for the deficiencies in the traditional teaching of pediatric otolaryngology & head and neck surgery, and improve the quality of the course of Otolaryngology-Head and neck surgery in children. In the implementa-tion, the course teaching is divided into four modules, "theoretical teaching module" "case discussion and interaction module" "after-school question answering and feedback module" and "clinical practice module"respectively. These modules are closely linked and connected, which can help enhance interacting with students, feedback teaching effect timely, and then improve the teaching quality and students' self-learning ability, thus make it possible to better cultivate pediatric clinical specialists.