Cyst with dot sign (neurocysticercosis)

Last revised by Mohammad Taghi Niknejad on 25 Aug 2024

The cyst with dot sign is seen in neurocysticercosis and represents the parasitic cyst with, usually eccentric, scolex.

It can be seen on both MRI and CT at:

  • the vesicular stage (CSF density / intensity cyst - denser / hyperintense scolex) and

  • colloidal vesicular stage (enhancement of wall and scolex)

It should not be confused with the cyst with dot sign of Rathke cleft cyst.

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