A 46-year-old man was presented with left lower quadrant pain and tenderness. The patient was afebrile and did not have leukocytosis. The abdominal CT showed a hypodense peri colonic oval mass of 2.5 cm with adjacent fat stranding.

What is the likely diagnosis in this case? *This case is from Docplexus editorial team for educative purpose only. Source: The Lancet