Gigantic Spinal Aneurysmal Bone Cyst in a Small Boy

A 9-year-old boy was operated on due to an aneurysmal bone cyst of the 4th lumbar vertebrae. Thereby, complete removal of the lesion and spinal reconstruction (dorsal spinal instrumentation and vertebral body replacement with titanium implants) was performed. He presented one year following surgery with back pain radiating into both sides. Physical examination and diagnostic testing revealed subcutaneous hardening in the back as well as on both sides. Magnetic resonance imaging (MRI) revealed a massive recurrence of the aneurysmatic bone cyst.