Much Debate has taken place concerning the use of lipiodol in the diagnosis and localization of spinal lesions. Little comment, however, has been devoted to misplaced injections of the material, although personal communications reveal that this mishap occurs also in other clinics. Misplaced lipiodol has been noted on our services occasionally, but it remained for one striking case to provoke an analysis of a series of 104 lipiodol spinograms. Observations On Aug. 26, 1940, a patient was seen in consultation who, after several falls, had suffered for a year with intermittent pain in the lower back and in the right and left legs alternately. Neurologic examination revealed no findings suggestive of any localized lesion of the caudal roots, and the picture was atypical for a protruded intervertebral disc, which had been suspected. An air spinogram had been made on Aug. 19, 1940, but this showed no abnormality. On Aug. 22, 1940, 4 c.c. of lipiodol were injected into the spinal canal. Roentgenograms and fluoro...