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Synovial cysts or ganglion cysts refer to a small fluid-filled lump that arises from joints or tendon sheaths. These mucin-filled lesions with a fibrous capsule (approximately 0.5- to 2-cm in size) may occur at many joints along the spine (Splavski et al., 2019). Synovial cysts may remain asymptomatic for a long time and occur as a consequence of rheumatoid arthritis or neuropathic arthropathy. These cysts typically non-malignant (benign) in nature and non-cancerous. Synovial cysts sometimes located extradural in the lumbar spine and produce symptomatic radiculopathy and back pain. Management of these lesions usually conservative, but sometimes the physician performs percutaneous aspiration or lumbar decompression procedure and fusion to improve the condition.