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pages = {40-3},  pubmed_id = {21977087},  }  @article{Muthukumar_2001,  doi = {10.1007/s005860100298},  url = {http://dx.doi.org/10.1007/s005860100298},  year = {2001},  month = {jun},  publisher = {Springer Science $\mathplus$ Business Media},  volume = {11},  number = {2},  pages = {162--166},  author = {Natarajan Muthukumar},  title = {{Sacral extradural arachnoid cyst: a rare cause of low back and perineal pain}},  journal = {European Spine Journal},  }