[Pitfalls in dacryocystorhinostomy].

Dacryocystorhinostomy is an easy and efficacious operation which gives highly successful results. Yet, there are a few difficulties to overcome if one is to carry out the operation quickly and successfully. The authors wish to recall that these difficulties may occur at different moments. when incising to avoid injuring angular vessels; when opening the tear sac or the nasal mucose; when removing the bone and when suturing the flops of the tear sac and nasal mucose together.