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Congenital spinal intradural arachnoid cyst involving almost the entire spine is very rare. We report a case of 15 years old boy, who presented with progressive spastic paraparesis with gait instability for last 4 months. MRI spine revealed thoracolumbar arachnoid cyst extending from D4 to L3 segment. Complete surgical excision of arachnoid cyst and laminoplasty was done. Patient recovered completely and histopathological examination of specimen confirmed the diagnosis of arachnoid cyst.