Ulcerative colitis complicating pneumomediastinum, subcutaneous emphysema and pneumothorax.

A 17-year-old man with ulcerative colitis (UC) presented to our hospital with neck pain and fever after vomiting. On examination, a snowflake sensation was noted in the neck. A chest radiograph showed extensive subcutaneous emphysema in the chest. CT scans showed extensive subcutaneous emphysema in the neck, shoulders and axilla, as well as pneumomediastinum and pneumothorax. A diagnosis of pneumomediastinum with exacerbation of UC was made, and he was fasted and treated with antibiotics. Intensive granulocyte and monocyte adsorption apheresis (GMA) was started for exacerbation of UC. His symptoms and the radiological findings of pneumomediastinum improved. He remained in remission on azathioprine. UC is a chronic inflammatory bowel disease (IBD) associated with extraintestinal manifestations (EIM). Very few cases have been complicated by pneumomediastinum. The increase in alveolar pressure due to vomiting and systemic inflammation-related pleural or esophageal damage may cause pneumomediastinum in this case. Prevention of progression to mediastinitis and treatment of exacerbated UC are contradictory. GMA was successful because it was not an immunosuppressive therapy. Our case highlights that rare EIM may complicate exacerbation of UC.