Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.

Example input: Abstract: Some patients converted from ventricular fibrillation to organized rhythms by defibrillation-trained ambulance technicians (EMT-Ds) will refibrillate before hospital arrival. The authors analyzed 271 cases of ventricular fibrillation managed by EMT-Ds working without paramedic back-up. Of 111 patients initially converted to organized rhythms, 19 (17%) refibrillated, 11 (58%) of whom were reconverted to perfusing rhythms, including nine of 11 (82%) who had spontaneous pulses prior to refibrillation. Among patients initially converted to organized rhythms, hospital admission rates were lower for patients who refibrillated than for patients who did not(53% versus 76%, P = NS), although discharge rates were virtually identical (37% and 35%, respectively). Scene-to-hospital transport times were not predictively associated with either the frequency of refibrillation or patient outcome. Defibrillation-trained EMTs can effectively manage refibrillation with additional shocks and are not at a significant disadvantage when paramedic back-up is not available.
Example output: Refibrillation managed by EMT-Ds
Example explanation: The abstract is about refibrillation and it is also mentioned in the abstract that it is managed by EMT-Ds. So it is an apt title.
Q: Abstract: One hundred forty-six consecutive specimens of excised bowel from patients with Crohn's disease were studied to determine the relationships between strictures, sinuses, and "fissures." A significant coincidence of sinuses and strictures was observed and sinuses tended to arise proximal to the point of maximal stricture. "Fissures," defined as blind-ending inflammatory tracts that did not penetrate through the full thickness of the muscle coat, were of two types. One type was associated with submucosal fibromuscular hyperplasia and repair and appeared to be an early sinus. The second type was in dilated ileum or colon in the bases of ulcers and is designated an "acute fissure." The anatomic findings suggest that both sinuses and fissures may be due to mechanical factors including intraluminal pressure rather than to any intrinsic quality of the inflammatory process in Crohn's disease.
A:
The strictures, sinuses, and fissures of Crohn's disease.