Definition: Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).
Input: Abstract: Fistula or deep sinus formation as a complication of xanthogranulomatous pyelonephritis (XPN) has not been described previously in the British literature. We present the clinicopathological features of one case of a nephrodiaphragmatic sinus complicating XPN, and three cases of nephrocolic fistula, including the first recorded case of fistula in childhood XPN. The detailed clinical, radiological and pathological features of XPN and its complications are reviewed. Total nephrectomy, together with primary excision of sinuses or fistulae, is the treatment of choice.
Which is the apt title for the abstract? option1: Fistula and sinus formation in xanthogranulomatous pyelonephritis. A clinicopathological review and report of four cases. option2: Polyethylene glycol-modified ragweed extract: comparison of two treatment regimens.
Output:
Fistula and sinus formation in xanthogranulomatous pyelonephritis. A clinicopathological review and report of four cases.