FIG 1. Case 5, group A. Images in a 63-year-old man with a nonfunctioning adenoma show that the HSI (arrow) was present both before and 2 weeks after surgery.

A–C, At 2 weeks after surgery, ovoid HSI is visible at the level of the diaphragm sellae on sagittal (A), coronal (B), and axial (C) sections.

D–F, Before surgery, linear HSI is visible at the posterolateral surface of adenoma, above the indentation formed by a diaphragma sellae, on the sagittal (D), coronal (E), and axial (F) sections.