Pituitary microadenoma

Case contributed by Bruno Di Muzio
Diagnosis almost certain


Elevated levels of prolactin.

Patient Data

Age: 30 years
Gender: Female

MRI Pituitary gland


The pituitary gland has normal dimensions and shows a nodular region of delayed enhancement in its anteroinferior aspect on the left, measuring up to 5.5 mm. The infundibulum is centered and has normal thickness. Optic chiasm and suprasellar cistern are unremarkable. 

Annotated image

Coronal T1 C+ delineating the nodular area of delayed enhancement in the inferior aspect of the pituitary gland. 

Case Discussion

This is a common daily finding for those radiologists reporting pituitary MRIs: a pituitary microadenoma.

It is defined as a nodular area of delayed enhancement within the pituitary gland, measuring less than 10 mm. For this patient, due the elevated prolactin levels, this most likely represents a micro prolactinoma, which is a functioning pituitary adenoma

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