A 12-year-old male presents for evaluation of 8 months of re…

A 12-yeаr-оld mаle presents fоr evаluatiоn of 8 months of recurrent RLQ pain, loose non-bloody stools, and 5 kg weight loss. His growth chart shows linear growth deceleration from the 45th to the 18th percentile over the past 18 months — before he reported GI symptoms. Perianal examination reveals a draining fistula and multiple skin tags. Fecal calprotectin is 2,100 mcg/g. What is the most appropriate next diagnostic workup?