Calcinosis/diagnostic imaging; Intervertebral Disc Displacement/diagnostic imaging; Intervertebral Disc/pathology; Thoracic Vertebrae/pathology; Adult; Aged; Calcinosis/physiopathology; Calcinosis/surgery; Decompression, Surgical/methods; Decompression, Surgical/statistics & numerical data; Diskectomy/methods; Diskectomy/statistics & numerical data; Dura Mater/injuries; Dura Mater/pathology; Dura Mater/physiopathology; Female; Humans; Intervertebral Disc/diagnostic imaging; Intervertebral Disc/surgery; Intervertebral Disc Displacement/physiopathology; Intervertebral Disc Displacement/surgery; Magnetic Resonance Imaging; Male; Middle Aged; Postoperative Complications/etiology; Postoperative Complications/pathology; Postoperative Complications/physiopathology; Retrospective Studies; Spinal Canal/pathology; Spinal Canal/physiopathology; Spinal Canal/surgery; Spinal Cord Compression/diagnosis; Spinal Cord Compression/physiopathology; Spinal Cord Compression/surgery; Subarachnoid Space/pathology; Subarachnoid Space/physiopathology; Thoracic Vertebrae/diagnostic imaging; Thoracic Vertebrae/surgery; Thoracoscopy/methods; Thoracoscopy/statistics & numerical data; Tomography, X-Ray Computed; Treatment Outcome