1.   Armed officers of the Border Patrol scour the American side of the narrow concrete tube along which the Rio Grande sadly makes its way.

2.   It appeared as a narrow tube with an invisible core extending from the ground to the base of a growing thunderstorm.

3.   No longer is it necessary to squint down a narrow tube at a tiny picture to follow the action being taped.

4.   Radiologist Graham Lee uses narrow tubes called catheters to inject a clot-buster called urokinase directly into clots.

5.   She sought out Lyons, who agreed to do the surgery laparoscopically, using narrow viewing tubes and instruments to avoid a major incision.

6.   Surgeons make several tiny incisions near the umbilicus, through which they insert narrow tubes.

7.   They reach the surface in narrow volcanic tubes, called pipes.

8.   To harvest the tissue, Fauza worked through a narrow tube inserted through small incisions in the uterus, his path guided by a tiny video camera lens.

9.   When the narrow tube opened up, we were once again standing upright in a large chamber.

10.   Bleeding ulcers can be effectively treated with an endoscope -- a long narrow tube inserted in the stomach to burn the ulcer.