RESUMEN
During January 1975 to December 1979, myelographic studies followed by operation was carried out on 150 cases of lumbar H.I.V.D. at Chung Nam National University Hospital. As to the myelographic findings, mode, level of indentation, and positive and negative finding were analyzed in comparison with operative findings. The followings results were obtained: 1. Plain radiography has a Iittle value In diagnosis of Iumbar H.I.V.D. about one third of 150 cases show significant sign in plain film study. 2. The major discrepancies between myelographic and operative findings were found in 11.3%, while the minor discrepancies were 4%, so giving an accuracy of 84.7%. 3. Positive myelographic finding(120 cases) consisted of smooth round defect in 83 cases (48.8%), unilateral wedge defect In 45 cases (26.4%), block defect In 18 cases (10.5%), bilateral wedge defect in 13 cases (7.6%), and hourglassdefect In 11 cases (6.4%), respectively. 4. Operative findings revealed the protruded disc: 74.5%, bulging: 11.1%, extruded: 22%, and mlgrated: 1.7%. 5. The myelographic finding of bulging type disc usually showed smooth round filling defect and those of protruded were smooth round filling defect, wedge shape and block filling defect, while the extruded type revealed smooth round filling defect In the most cases. 6. The myelography can be a valuable aid in the determination of the level and degree of H.I.V.D. and very helpful ln differential diagnosis.