TY - JOUR T1 - MR Imaging of a Hemorrhagic and Granulomatous Cyst of the Ligamentum Flavum with Pathologic Correlation JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 1166 LP - 1168 VL - 20 IS - 6 AU - Houman Mahallati AU - Carla J. Wallace AU - K. Michael Hunter AU - Juan M. Bilbao AU - Arthur W. Clark Y1 - 1999/06/01 UR - http://www.ajnr.org/content/20/6/1166.abstract N2 - Summary: Cysts of the ligamentum flavum are uncommon causes of neurologic signs and symptoms and usually are seen in persons over 50 years of age. We report a case of an epidural cyst located in the ligamentum flavum, which contributed to spinal stenosis in a 30-year-old man. Radiologic features were similar to those of a synovial cyst, but synovium was not identified histologically. The imaging and pathologic features were unusual, including hemorrhage and a fibrohistiocytic reaction with giant cells. ER -