Kassam classification

Craniopharyngioma endonasal approach

Type I

Preinfundibular

Type II

Transinfundibular

Type III

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

Type IV

Isolated third ventricular

Reference

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.