Spinal arachnoid cyst
The patient presented with back pain.
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Two intraspinal extramedullary intradural lesions are seen abutting the posterior aspect of the dorsal cord and displacing it anteriorly. They follow CSF signal (low signal on T1, high signal on T2 with no post contrast enhancement) on all sequences.
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Spinal arachnoid cysts are benign central canal lesions. On MRI they appear as masses with CSF-like signal (low signal on T1, high signal on T2 with no post contrast enhancement). The wall of an arachnoid cyst can not be appreciated in MRI.