Intraspinal epidermoid tumors may be congenital or acquired in origin. Lumbar punctures performed with needles without stylets or with ill-fitting stylets are responsible for the implantation of epidermal fragments into the spinal canal and the resultant iatrogenic intraspinal epidermoid tumors. Pain in the back or lower extremities is a striking clinical feature in these cases. Myelography should be considered for every patient who has pain in the lower extremities or back and who has had previous lumbar punctures.
(JAMA 237:148-150, 1977)
Batnitzky S, Keucher TR, Mealey J, Campbell RL. Iatrogenic Intraspinal Epidermoid Tumors. JAMA. 1977;237(2):148–150. doi:10.1001/jama.1977.03270290048026
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