Psoas Abscess Presented as Right Hip Pain in a Young Adult With Crohn's Disease.

A 27-year-old man with a past medical history of Crohn's disease presented in the Emergency Department complaining of right hip pain that has been going on for one month. At presentation, the patient was tachycardic. Physical examination revealed a positive psoas sign. Laboratory tests showed elevated white blood cells, C-reactive protein, and erythrocyte sedimentation rate. Computed tomography of the abdomen and pelvis revealed ileo-psoas fistula and psoas abscess. This rare case aims to provide awareness that intra-abdominal pathology should always be suspected in patients with referred hip pain and Crohn's disease. A thorough physical examination including maneuvers for assessment of possible iliopsoas inflammation should be effectively performed at the bedside to determine the likelihood of the condition and proper imaging should follow to confirm the diagnosis.