A 4-yr old, previously healthy girl, born at term, has 3 days of generalized abdominal pain. Exam shows normal vital signs and a mildly tender abdomen without peritoneal signs. Abdominal ultrasound (shown) demonstrates a normal appendix, and a very thickened gallbladder wall (7 mm), without stones. The biliary tree is normal. L:ab tests show a mildly elevated CRP (28) and normal CBC & lipase. The AST, ALT, and direct bilirubin are mildly elevated. How will you treat this patient?
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