Aneurysmal Bone Cyst of C2 Cervical Spine Presenting as an Asymptomatic Posterior Neck Swelling

Abstract

Aneurysmal Bone Cysts (ABC) are benign tumour-like expansile lytic lesions commonly affecting metaphysis of long bones. They are relatively rare in vertebral column accounting for about 12 to 30% of all ABC cases, predominantly involving posterior elements. ABC of cervical spine account for only 2% cases. They commonly present as back pain, palpable mass, spinal deformity, rarely pathological fracture and neurological deficit (paraplegia, cord compression, and cauda equina syndrome). Surgical treatment of ABC of cervical spine in paediatric patients is challenging because of proximity of lesions to neurovascular structures and the potential remaining growth of the spine. Here, we report a case of ABC of C2 vertebra with isolated posterior arch involvement who presented with a palpable posterior nuchal swelling and skin discoloration without any neurological deficit or difficulty in neck movement. Biopsy led to the definite diagnosis of ABC.

Keywords

• back pain
• fluid-fluid level
• palpable mass
• tumour