Multilevel thoracic and lumbar ligamentum flavum ossification in an achondroplasic-a rare presentation.

Achondroplasic patients may present rarely with multiregional and multilevel OLF. It is important to identify them preoperatively so as to have good surgical outcome. Wide laminectomy, removal of the ossified ligament, and fusion with instrumentation resulted in the improvement of the patient's neurological symptoms and functions.