1. Prepared by Katelynn Davis MD and reviewed by Lori Sokoll PhD

The patient is an adult with a past medical history of Crohn's disease status post hemicolectomy over 10 years ago. They presents to an outpatient clinic for follow-up and reports continued intermittent, chronic abdominal pain but overall does not have significant medical changes. Laboratory studies including a complete metabolic panel are performed and are remarkable for a calcium of 8.7 mg/dL (reference range 8.4 - 10.5 mg/dL) and phosphorus of 2.2 mg/dL (reference range 2.7 - 4.5 mg/dL).

Which of the following diagnoses is compatible with the laboratory findings?