[Arachnoid web presenting as tetraparesis].

Arachnoid webs are rare intradural lesions which disrupt cerebrospinal fluid flow and may cause spinal cord compression. This is a case report of a previously healthy 19-year-old woman who presented with acute back pain and rapidly progressive tetraparesis. MRI revealed cervical spinal cord ischaemia and an arachnoid web at the thoracic level. Surgical removal led to partial neurological recovery. Early recognition is essential, as timely surgery may prevent irreversible injury.