FIG 4.

Basal recess at the infundibular portion of 3V papillary craniopharyngiomas. MR imaging characterization in seminal cases from the medical literature (A₁–A₂). Diverticulum-like recess at the base of a strict 3V papillary CP identified on preoperative MR imaging (Online Supplemental Data). On the midsagittal T1WI (A₁), the hypointense recess (black arrowhead) is open at the suprasellar cistern and extends to the tumor center, following the same trajectory as the PS. The coronal-transinfundibular MR image (A₂) shows the hypointense signal of the recess identical to CSF, indicating free passageway of CSF between the suprasellar cistern and the recess and the rounded dead end of the recess at the tumor center. Reproduced with permission from the Fukushima et al.⁸ B, Duct-like long-recess type in a strict papillary CP (Online Supplemental Data). This midsagittal T2WI shows the hyperintense signal of the duct, identical to that in the CSF (white arrow). Reproduced with permission Gu et al.²¹ C, Coronal-transinfundibular T1WI of a short-type basal DR in a strict 3V PCP (Online Supplemental Data). Note the isointense rim of the 3V floor covering the undersurface of this solid homogeneously gadolinium-enhancing tumor and how the 3VF invaginates at the midline of the basal pole of the CP to form the recess (white arrow). Reproduced with permission from Rambarki and Rajesh.²² PG indicates pituitary gland; MB, mammillary body; OC, optic chiasm.