Storming the castle: A case report of multi-system dysregulation in a child with Castleman disease.

Castleman disease is a non-clonal, lymphoproliferative disorder rarely seen in children. Presented is a 12-year-old male with progressive abdominal pain, vomiting, and fever. Diagnostic testing revealed multi-organ system involvement and the diagnosis was ultimately made with tissue biopsy. Marked disease regression occurred after high-dose steroids and continued interleukin-6 inhibition.