Fig. 9

Spinal neurocysticercosis. a Axial T2-weighted MR image, showing a cystic lesion in the subarachnoid space of the dural sac in the sacrum. There is a dot with lower signal intensity inside the cyst representing the protoscolex (“cyst with dot” sign) in a vesicular stage. b Coronal T2-weighted MR image of the same patient as in a. The intradural cyst (arrows) has a signal intensity similar to the CSF, note also the thin walls and the high signal intensity protoscolex inside the cyst, these are typical findings of a vesicular stage neurocysticercosis