Cyst with dot sign (neurocysticercosis)

Dr Craig Hacking and A.Prof Frank Gaillard et al.

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 dot that can be seen in a Rathke cleft cyst.

Share article

Article information

rID: 4773
Section: Signs
Synonyms or Alternate Spellings:
  • Cyst with a dot sign

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Case 2: orbital cisticercosis
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.