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AIM:To illustrate the magnetic resonance(MR) myelography features in the disease of lumbosacral nerve roots.METHODS:MR myelography using heavily T2 weighted spin echo imaging with fat suppression was performed in 75 cases with chronic pain of waist on a Siemens Magneton Impect 1.0 T MR unit.Maximum intensity projection (MIP) was used for image reconstruction.RESULTS:The thecal maugins,nerve roots and nerve root sheaths were well demonstrated on MR myelography image.In 75 patients with chronic of waist, nerve root disease was found in 11 cases. 6 nerve root abnormality(8% ),2 perineural cyst (3% ),3 neurofibroma (4% ) had their own MR myelography features.CONCLUSION:MR myelography can show the morphologic and structural change of lumbosacral nerve roots.In MR myelography image, disease of lumbosacral nerve roots has a characteristic finding.MR myelography is very useful in diagnosis of nerve root disease.