The recent work of Ayer1 on the use of combined cistern and lumbar puncture for the detection of spinal subarachnoid block, and the work of Dandy and Blackfan2 on the use of dyes in the diagnosis of obstructive hydrocephalus, have suggested a procedure which may be of use in the localization of spinal cord tumors at operation.
In principle the method consists of two steps: first, the demonstration of spinal subarachnoid block, by the Ayer method; second, the injection of a dye into the cisterna magna, or into the lumbar subarachnoid space. The injection is made immediately prior to operation. Assuming that the lumbar route has been used, the dye will diffuse through the subarachnoid space up to the lower pole of the tumor. The existence of a subarachnoid block will prevent its going beyond this point. If the laminectomy opening is below the tumor, on opening the
SELLING L. A SUGGESTION FOR THE USE OF DYES IN THE LOCALIZATION OF SPINAL CORD TUMORS AT OPERATION. Arch NeurPsych. 1922;8(1):27-30. doi:10.1001/archneurpsyc.1922.02190130030004