
The adrenal gland consists of two portions: an outer cortex and an inner medulla. Proportionately, the adrenal size is larger in neonates and infants, being almost one-third of the size of the kidney 2-4. The right adrenal gland has a maximum width of 6.1 mm and the left adrenal gland has a maximum width of 7.9 mm 6. While left adrenal gland is triangular or Y-shaped 1,11. However, the right adrenal gland is usually more pyramidal in shape while the left adrenal gland is more crescentic 7. On cross-section, right adrenal gland is linear, comma or V-shaped with larger medial limb and smaller lateral limb.

Each gland is enclosed in the perirenal fascia and each has a body and two limbs: a medial limb and a lateral limb.
