Eighty patients, who had symptoms and signs of cervical spondylosis and/or disk were studied with myelography(using Omnipaque) followed by postmyelographic CT to evaluate the relative efficacy of these two methods in the determination of cervical herniation and spondylosis. Thirtynine levels in 26 patients were confirmed by surgery.Of these, 20 levels proved to have operative evidence of herniatied disk. Postmyelographic CT adds useful informmation to the myelographic findings. Cord and root compression are better evaluated and osteophytes can bedifferentiated from disk herniation. In osteophytes, myelography was as diagnostic as postmyelogaphic CT, But, disk herniation was identified in 70%(14/20 levels) with postmyelographic CT and only in 15% (3/20 levels) with myelography.