Abstract
A21-year-oldmale patient was admitted to orthopedic clinic with complaint of back pain. His X-ray image at the lumbar 2 vertebral level showed spinal canal extension and pedicle thinning (Fig. 1). A lumbosacral spine computerized tomography scan was then performed. Computerized tomography showed fat density (−102 Hounsfield unit) mass (maximum dimension: 6.2×4.0×3.3 cm) containingmillimeter-scale calcifications located in the conus medullaris-cauda equina that expands the spinal channel (Fig. 2). Lumbar contrast-enhanced magnetic resonance imagingwas performed, and it demonstrated a welldefined expansible mass at the tip of the conusmedullaris. The lesion was hypointense on short tau inversion recovery (STIR) magnetic resonance images, with no enhancement (Fig. 3). The diagnosis was consistent with a dermoid cyst and was confirmedbysurgery.The smooth surface thinning seen in thepedicle suggests the presence of a benign intraspinal mass; radiographs should be sought in this finding.
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