An abdominal pain that looks like a ring

A 53-year-old man presented with severe pain in the left iliac fossa for 2 days without nausea, vomiting, diarrhea, and fever. He was affected by type 2 diabetes mellitus and denied any previous episodes of diverticulitis. Physical examination revealed abdominal tenderness and guarding. Laboratory tests, including C reactive protein, were within the normal range. Point-of-care Ultrasound (US) showed a focal, non-compressible, oval (0.6 x 1 cm), hyperechoic mass with a hypoechoic rim, located directly under the abdominal wall at the point of maximum tenderness. Enhanced Computed Tomography (CT) of the abdomen was performed (Figure 1) and confirmed the diagnostic suspicion.