Hippocampal sulcus remnant cyst

Dr Craig Hacking and Dr Maxime St-Amant et al.

Hippocampal sulcus remnant cysts are remnants of incomplete involution of the embryonic hippocampal fissure and are an incidental finding.  


They are seen in ~25% (range 10-40%) of the adult population 1,3.

Radiographic features


They consist of small (1-2 mm) cystic lesions that follow CSF on all sequences. They are found between the dentate gyrus and the cornu ammonis.

Differential diagnosis

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Article information

rID: 24971
Section: Anatomy
Synonyms or Alternate Spellings:
  • Hippocampal sulcus remnant

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