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A spinal disc herniation (prolapsus disci intervertebralis) is a medical condition affecting the spine due to trauma, lifting injuries, or idiopathic (unknown) causes, in which a tear in the outer, fibrous ring (annulus fibrosus) of an intervertebral disc (discus intervertebralis) allows the soft, central portion (nucleus pulposus) to bulge out beyond the damaged outer rings Read more: http://www.answers.com/topic/herniated-disk#ixzz3N1U4zcHj

The term epidural (from Ancient Greek ἐπί, "on, upon" + dura mater) is a simplified and all-inclusive term often used to refer to techniques such as epidural analgesia and epidural anaesthesia. The epidural route is frequently employed by certain physicians and nurse anaesthetists to administer diagnostic (e.g. radiocontrast agents) and therapeutic (e.g., glucocorticoids) chemical substances, as well as certain analgesic and local anaesthetic agents.

A lumbar puncture (or LP, and colloquially known as a spinal tap) is a diagnostic and at times therapeutic medical procedure. Diagnostically it is used to collect cerebrospinal fluid (CSF) to confirm or exclude conditions such as meningitis and subarachnoid hemorrhage and it may be used in diagnosis of other conditions