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.
- 1. Teitelbaum GP, Otto RJ, Lin M et-al. MR imaging of neurocysticercosis. AJR Am J Roentgenol. 1989;153 (4): 857-66. AJR Am J Roentgenol (abstract) - Pubmed citation
- 2. Osborn AG, Preece MT. Intracranial cysts: radiologic-pathologic correlation and imaging approach. Radiology. 2006;239 (3): 650-64. doi:10.1148/radiol.2393050823 - Pubmed citation