Case report: C1/2 rotational instability progressing to extreme subaxial hyperkyphosis in an adolescent with severe catatonia

•Cervical deformity associated with schizophrenia is extremely rare.•Only two comparable cases reported.•Effective surgical management for severe cervical deformity in psychiatric patient.•Long-term improvement in spinal alignment and psychiatric symptoms post-surgery.•Rare insight into spinal deformities associated with psychiatric conditions.