We describe 3 Cases of surgically proved spinal intradural arachnoid cysts. Two cases were developed after antecedent tuberculous infection of the central nervous system and in 1 case the cause was uncertain but presumed to be an acquired condition. The location of the cysts were cervical, cervicothoracic, and thoracic spine level respectively. On the magnetic resonance(MR) images, the lesions were presented as widening of subarachnoid spacewith spinal cord compression and atrophy. The cysts were slightly hyper-(case1 and 2) or hypo-(case 3) intense tothe cerebrospinal fluid on T1-weighted images and isointense with internal heterogeneous dark portion of T2-weighted images. In 2 cases which had previous history of tuberculosis, accompanying syringomyelias were noted,precise localization and diagnosis were obtained with MR pre-operatively.