Definition: Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
Input: Abstract: Episodic arthritis is an uncommon manifestation of cystic fibrosis. We describe the case of a 21-year-old man with cystic fibrosis who suffered from episodic arthritis associated with vasculitic skin lesions. Aetiology is discussed with reference to the possible role of immune complex disease.

Episodic arthritis in cystic fibrosis: a case report.