"As originally described by Yuh et al. 1, the ratio between the pituitary height loss (h) and the sellar height (H) is measured on a midsagittal T1-weighted image and described in the following "categories" (grades):"
"II: mild concavity of the superior aspect of the gland with mild loss of pituitary height (h < ⅓ H)"
"III: moderate loss of pituitary height (⅓ H < h < ⅔ H)"
"III: moderate loss of pituitary height (⅓ H < h < ⅔ H)"
"IV: severe loss of pituitary height (h > ⅔ H)"
Expected headings
"Clinical significance"