Adrenal Washout

Absolute et Relative Washout CT

Densité sans injection (HU)

Densité portale (HU)

Densité tardive 15 min (HU)

Formules :

Absolute Washout = (Enhanced − Delayed) / (Enhanced − Unenhanced) × 100

Relative Washout = (Enhanced − Delayed) / Enhanced × 100

Seuils : Absolute ≥ 60% ou Relative ≥ 40% → adénome. Unenhanced ≤ 10 HU → adénome lipidique.

Références : Caoili EM et al. Adrenal masses: characterization with combined unenhanced and delayed enhanced CT. Radiology 2002;222(3):629-633.