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Spine Anatomy & Glossary A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Tarlov Cyst: A cyst found in the lower cauda equina. These are benign and cause no symptoms. Thecal Sac: Located in the spinal canal; it contains the cauda equina, cerebrospinal fluid and spinal cord. thoracic - The middle portion of the spine; there are 12 thoracic vertebrae. TLIF - transforaminal lumbar interbody fusion. transverse process - The "wings" of the spine which are located posteriorly. tumors - An abnormal growth of tissue which causes bone destruction.