Background: Epidermoid cysts (ECs) are rare. benign lesions which comprise less than 1 % of all spinal tumors. Calcification of spinal ECs is rare. and EC ossification within the lumbar spine has never been documented. https://kwfubfqq0jgvmy.timeblog.net/70682649/a-survey-on-theories-and-applications-for-self-driving-cars-based-on-deep-learning-methods