Paraspinal soft-tissue mass

Common: Abscess; Achalasia; Anatomic variant; Diffuse idiopathic skeletal hyperostosis; Dural ectasia; Esophageal dilatation; Extruded disk; Ganglioneuroma; Hematoma; Leukemia; Lymphadenopathy; Lymphoma; Malignant peripheral nerve sheath tumor; Metastasis; Multiple myeloma; Neuroblastoma; Neurofibroma; Osteomyelitis of spine with abscess; Pleural effusion; Pleural empyema; Schwannoma; Spinal osteoarthritis; Tortuous aorta
Uncommon: Adrenal neoplasm; Amyloidosis; Bochdalek hernia; Bronchogenic cyst; Chemodectoma; Chordoma; Dilated azygos system; Duplication cyst; Extralobar pulmonary sequestration; Extramedullary hematopoiesis; Fibromatosis; Giant cell tumor; Hydatid disease; Hydroureter; Langerhans cell histiocytosis; Mediastinal varices; Meningocele; Mesothelioma; Mustard procedure; Neurenteric cyst; Paget disease of bone; Pancreatic neoplasm; Pancreatic pseudocyst; Pheochromocytoma; Posterior mediastinal neoplasm; Primary vertebral neoplasm; Retrocaval ureter; Retroperitoneal fibrosis; Retroperitoneal neoplasm; Rhabdomyosarcoma; Sarcoma; Splenosis; Thoracic kidney