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Abstract: Background context: There have only been four reports of gas-filled intradural cysts, and the pathogenesis is unknown. Purpose: To document the radiologic and histopathologic features of gas-filled intradural cysts and to discuss the pathogenesis with a review of the literature. Study design: Case report. Methods: A 67-year-old woman, admitted to our institute, presented with severe right thigh pain. On admission to the institute, enhanced magnetic resonance imaging, showed a cystic lesion in the spinal canal at the L2–L3 level, with an intensity suggesting the presence of gas. An enhanced region around the cyst was noted. Computed tomography after discography also revealed a water-soluble contrast filled the subarachnoid space and area around the cyst, but not inside. Results: The cyst was surgically resected. One of the nerve roots was firmly adherent to the gas-filled cyst. The cyst wall comprised fibrous tissue, including small granulations and herniated disc material. Conclusion: Gas-filled intradural cysts are rare. The pathogenesis appears to involve gas in a degenerated intervertebral disc, and spontaneous absorption of herniated disc material. [Copyright &y& Elsevier]

Abstract: Background context: There have only been four reports of gas-filled intradural cysts, and the pathogenesis is unknown. Purpose: To document the radiologic and histopathologic features of gas-filled intradural cysts and to discuss the pathogenesis with a review of the literature. Study design: Case report. Methods: A 67-year-old woman, admitted to our institute, presented with severe right thigh pain. On admission to the institute, enhanced magnetic resonance imaging, showed a cystic lesion in the spinal canal at the L2–L3 level, with an intensity suggesting the presence of gas. An enhanced region around the cyst was noted. Computed tomography after discography also revealed a water-soluble contrast filled the subarachnoid space and area around the cyst, but not inside. Results: The cyst was surgically resected. One of the nerve roots was firmly adherent to the gas-filled cyst. The cyst wall comprised fibrous tissue, including small granulations and herniated disc material. Conclusion: Gas-filled intradural cysts are rare. The pathogenesis appears to involve gas in a degenerated intervertebral disc, and spontaneous absorption of herniated disc material. [Copyright &y& Elsevier]

Abstract: Background context: There is no previous report on the intraspinal ganglion cyst of the posterior longitudinal ligament in a teenager. Purpose: To report a case of radiculopathy caused by a ganglion cyst of the posterior longitudinal ligament in a teenager. Study design: Case report. Methods: A 17-year-old male with a 4-month history of left L5 radicular pain was found to have an intraspinal cystic lesion causing radicular compression. Magnetic resonance imaging showed a cystic lesion located in the ventral side of the dura. The patient suffered from severe leg pain. As a result, a surgical operation was therefore performed. Results: The cyst containing jelly-like components and a hemorrhage was punctured and then extirpated. It originated from the posterior longitudinal ligament. A histological study revealed the cyst to be without any synovial layers. Conclusions: This is the first report to describe a ganglion cyst originating from the posterior longitudinal ligament in a teenager. This possible etiology should be kept in mind for any other individuals displaying symptoms of spinal nerve root compression as well as disc herniation. [Copyright &y& Elsevier]

Abstract: Background context: There is no previous report on the intraspinal ganglion cyst of the posterior longitudinal ligament in a teenager. Purpose: To report a case of radiculopathy caused by a ganglion cyst of the posterior longitudinal ligament in a teenager. Study design: Case report. Methods: A 17-year-old male with a 4-month history of left L5 radicular pain was found to have an intraspinal cystic lesion causing radicular compression. Magnetic resonance imaging showed a cystic lesion located in the ventral side of the dura. The patient suffered from severe leg pain. As a result, a surgical operation was therefore performed. Results: The cyst containing jelly-like components and a hemorrhage was punctured and then extirpated. It originated from the posterior longitudinal ligament. A histological study revealed the cyst to be without any synovial layers. Conclusions: This is the first report to describe a ganglion cyst originating from the posterior longitudinal ligament in a teenager. This possible etiology should be kept in mind for any other individuals displaying symptoms of spinal nerve root compression as well as disc herniation. [Copyright &y& Elsevier]