Kassam classification

Craniopharyngioma endonasal approach

Type I


Type II


Type III

Post- or retroinfundibular, further subdivided based on rostral extension (infundibular recess, hypothalamic) or caudal extension (interpeduncular fossa)

Type IV

Isolated third ventricular


Kassam AB, Gardner PA, Snyderman CH, Carrau RL, Mintz AH, Prevedello DM. Expanded endonasal approach, a fully endoscopic transnasal approach for the resection of midline suprasellar craniopharyngiomas: a new classification based on the infundibulum. J Neurosurg. 2008 Apr.;108(4):715-728.