1. Epidural anesthesia in three parturients with lumbar tattoos: a review of possible implications;Douglas;Can J Anaesth,2002
2. Intraspinal epidermoid tumour: late complication of lumbar puncture;Gardner;CMAJ,1989
3. Intraspinal epidermoid tumors caused by lumbar puncture;McDonald;Arch Neurol,1986
4. Incidence of tissue coring with the 25-gauge Quincke and Whitacre spinal needles;Campbell;Reg Anesth,1996
5. The incidence of tissue coring during the performance of caudal injection in children;Goldschneider;Reg Anesth Pain Med,1999