What is the Diagnosis?

How good of a diagnostician are you? This challenge from the New England Journal of Medicine is tough. (I missed it the first time).Q: This 12 year old presented with decreased appetite and vomiting. What is the most likely diagnosis?1. Endometrioma2. Hernia3. Keloid4. Intraabdominal cancer5. Urachal duct cyst.Click on the image for a better view and make your guess. The answer will be posted