Male, 17 years old, with unilateral galactorrhea. Assess for pituitary mass. The pituitary gland is of normal size. No discrete masslike lesions are seen. A 2 mm long linear focus of hypoenhancement is evident in the midline of the gland at the junction of the anterior and posterior portions. Elsewhere, the gland demonstrates relatively homogeneous enhancement. The pituitary stalk also enhances normally and enters the gland at midline. The suprasellar cistern is patent. The visualized optic apparatus is unremarkable. Opacification of one of the right ethmoid air cells is seen.
No definite sellar or suprasellar masses are identified. A linear focus of hypoenhancement at the junction of the anterior and posterior pituitary glands is favored to represent a pars intermedia cyst with microadenoma as a less likely diagnosis. 