Legend MRI Brain; Ax T2W (left top, center, right bottom): Well-defined hyperintense lesions within the S1 foramina extend anteriorly through the foramina. Ax T1W (right top): The lesions are hypointense and homogeneous.

Legend MRI Brain; Sag T1W (left and center): The lesions are hypointense and extend through the S1 and S2 foramina into the pelvis. Sag T2W (right bottom): The lesions are hyperintense. Ax T1W Post-Gd (right top): No enhancement of the lesions. Key words: mri lumbar developmental congenital

Spine Diagnosis: Tarlov cysts (Root sleeve cysts, Perineural cysts)