Table 2.

Summary of the morphological characteristics of cysts in the respective groups

Group	Arachnoid cysts	Connective tissue cysts	Aberrant cysts
Thickness variation	20-150 μm	30-800 μm	6-400 μm
Connective tissue layer	Thin	Thick; major part of cyst wall	Thin
Meningothelial epithelium	Dominant on both sides	Sparsely present	Sometimes present on dural side
Luminal epithelium	One to several layers	Single layer	Stratified or single layer
Luminal cilia	Not present	Not present	Often present
Luminal microvilli	Sparse	Sparse	Abundant
Junctional complexes	Tight and adherence junctions, desmosomes	Simple	Elaborate; tight, adherence, and gap junctions, desmosomes
Glial cell processes	Not present	Not present	Often present
Neuropil	Not present	Not present	Present in one cyst