Ossification of the ligamentum flavum(OLF) is not infrequent in the cervical and lumbar regions but is very rare inthe thoracic spine. We reported a 62-year-old women with left thoracic intercostal neuralgia due to an OLF. Physicaland neurological examination were normal. MRI showed an OLF with compression of the thecal sac in the posterolateralaspect of the T9-T10 level. Laminectomy and removal of the ligament resulted in marked clinical improvement. OLFis known to cause thoracic radiculomyelopathy, but presentation with intercostal neuralgia only is very rare.
