Balloon dacryocystoplasty has been reported to be a safe, easy and effective nonoperative treatment for nasolacrimal stenosis. The results were not encouraging, however, because of its high failure and recurrence rates. To evaluate the feasibility of using modified Gianturco expandable metallic stents for maintenance of the dilated nasolacrimal system (NLS), 20 stents fo 3 mm in diameter and 10mm long were placed in 20 nasolacrimal ducts of 10dogs for 1 month to 10 months. It was more difficult to introduce the stents into the proximal portion(A) of the NLS than into the distal portion(B) due to the narrow and bony canal of the A portion. Twenty stents showed no migration in follow-up studies of up to 10 months. One complete occlusion occurred in a stent placed in A portion. Autopsy showed stents were covered with epithelium withi 2 months after placement. Our experience suggest that the placement of Gianturco self-expandabel stents may be a useful method of dilating and maintaining the luminal diameter of the NLS. although care must be taken to select the proper stent size.