References
1. Chaichana KL, Pradilla G, Witham TF, Gokaslan ZL, Bydon A. The clinical significance of pneumorachis: a case report and review of the literature. J Trauma Inj Infect Crit Care. 2010;68:736–44.
2. Ford L, Gilula L, Murphy W, Gado M. Analysis of gas in vacuum lumbar disc. AJR Am J Roentgenol. 1977;128:1056–7.
3. Lardé D, Mathieu D, Frija J, Gaston A, Vasile N. Spinal vacuum phenomenon: CT diagnosis and significance. J Comput Assist Tomogr. 1982;6:671–6.
4. Resnick D, Niwayama G, Guerra J, Vint V, Usselman J. Spinal vacuum phenomena: anatomical study and review. Radiology. 1981;139:341–8.
5. Gower WE, Pedrini V. Age-related variations in proteinpolysaccharides from human nucleus pulposus, annulus fibrosus, and costal cartilage. J Bone Joint Surg Am. 1969;51:1154–62.
6. Yoshida H, Shinomiya K, Nakai O, Kurosa Y, Yamaura I. Lumbar nerve root compression caused by lumbar intraspinal gas: Report of Three Cases. Spine (Phila Pa 1976). 1997;22:348–351.
7. Sauser DD, Goldman AB, Kaye JJ. Discogenic vertebral sclerosis. J Can Assoc Radiol. 1978;29:44-50.
8. Coulier B. The spectrum of vacuum phenomenon and gas in spine. JBR-BTR. 2004;87:9-16.
9. Pierpaolo L, Luciano M, Fabrizio P, Paolo M. Gas-containing lumbar disc herniation: a case report and review of the literature. Spine (Phila Pa 1976). 1993;18:2533–2536.
10. Bosser V, Dietemann JL, Warter JM, Granel de Solignac M, Beaujeux R, Buchheit F. L5 radicular pain related to lumbar extradural gas-containing pseudocyst: Role of CT-guided aspiration. Neuroradiology. 1990;31:552–3.
11. Demierre B, Ramadan A, Hauser H, Reverdin A, Rilliet B, Berney J. Radicular compression due to lumbar intraspinal gas pseudocyst: case report. Neurosurgery. 1988;22:731–733.
12. Lee CH, Cho JH, Hyun S-J, Yoon SH, Kim K-J, Kim HJ. Symptomatic gas-containing herniated disc with the vacuum phenomenon: mechanism and treatment. Neurol Med Chir (Tokyo). 2012;52:106–8.
13. Hasni Bouraoui I, Gamoun W, Mrad Dali K, Boughammoura H, Hmila S, Arifa N, et al. Pneumorachis : illustration de trois étiologies rares. J Radiol. 2010;91:495–9.
14. Mehta TA, Sharp DJ. Acute cauda equina syndrome caused by a gas-containing prolapsed intervertebral disk. J Spinal Disord. 2000;13:532–4.
15. Song KJ, Lee KB. Spontaneous extradural pneumorrhachis causing cervical myelopathy. Spine J. 2009;9:e16–8.
16. Giraud F, Fontana A, Mallet J, Fischer LP, Meunier PJ. Sciatica caused by epidural gas. Four case reports. Joint Bone Spine. 2001;68:434–7.
17. Odderson IR, Matthies R. Lumbar radiculopathy and intraspinal gas. J Back Musculoskelet Rehabil. 1995;5:155–8.
18. Kim CH. Pneumorrhachis and paraspinal air with vacuum disc : case report and literature review. J Korean Neurosurg Soc. 2007;42:490.
19. Impiombato FA, Lunghi V, Gambacorta D, Zocchi M. Treatment of a symptomatic epidural gas cyst using an angiographic 5F catheter in the epidural space of the spinal cord through the sacral hiatus: a case report. Neuroradiol J. 2011;24:914–8.
20. Pak KI, Hoffman DC, Herzog RJ, Lutz GE. Percutaneous intradiscal aspiration of a lumbar vacuum disc herniation: a case report. HSS J. 2011;7:89–93.
21. Kumar R, West CGH, Gillespie JE. Gas in a spinal extradural cyst: Case report. J Neurosurg. 1989;70:486–8.
22. Ricca GF, Robertson JT, Hines RS. Nerve root compression by herniated intradiscal gas: Case report. J Neurosurg. 1990;72:282–4.
23. Cheng TM, Link MJ, Onofrio BM. Pneumatic nerve root compression: epidural gas in association with lateral disc herniation: Report of two cases. J Neurosurg. 1994;81:453–8.
24. Belfquih H, mostarchid BE, Akhaddar A, gazzaz M, Boucetta M. Sciatica caused by lumbar epidural gas. Pan Afr Med J. 2014;18:162.
25. Akhaddar A, Eljebbouri B, Naama O, Boucetta M. Sciatica due to lumbar intraspinal gas pseudocyst. Intern Med. 2010;49:2647.
26. Tamburrelli F, Leone A, Pitta L. A rare cause of lumbar radiculopathy: spinal gas collection. J Spinal Disord. 2000;13:451–4.
27. Kawaguchi S, Yamashita T, Ida K, Ikeda T, Ohwada O. Gas-filled intradural cyst of the lumbar spine: case report. J Neurosurg Spine. 2001;95:257–9.
28. Konya D, Ozgen S, Sun IH, Pamir NM. Intraspinal gas. J Clin Neurosci Off J Neurosurg Soc Australas. 2007;14:569–72.
29. Ryu KS, Rathi NK, Shin MH, Park CK. Gas-containing disc herniations: dual nerve root compression at a single disc level. Neurol Med Chir (Tokyo). 2012;52:649–51.
30. Hidalgo-Ovejero ÁM, García-Mata S, Gozzi-Vallejo S, Izco-Cabezón T, Martínez-Morentín J, Martínez-Grande M. Intradural disc herniation and epidural gas: something more than a casual association?. Spine (Phila Pa 1976). 2004;29:463–7.
31. Mortensen WW, Thorne RP, Donaldson WF. Symptomatic gas-containing disc herniation. Report of four cases. Spine (Phila Pa 1976). 1991;16:190–2.
32. Anda S, Støvring J, Rø M. CT of extraforaminal disc herniation with associated vacuum phenomenon. Neuroradiology. 1988;30:76–7.
Fig1: Spinal CT scan: Sagittal (a), axial (b,c) showing a vacuum disc phenomenon and moderate protrusion at L5-S1 space. A gas bubble was noticed in the right lateral recess at L4-L5 with probable evidence of right L4 root compression
Fig 2: Spinal CT scan axial showing foraminal disc protrusion with intradiscal gas compressing the left L5 nerve root