Pituitary MRI - normal study

Case contributed by A.Prof Frank Gaillard

Presentation

Borderline elevated prolactin.

Patient Data

Age: 25 years
Gender: Female
MRI

MRI pituitary

Technique:

Multiplanar, multisequence imaging has been obtained through the brain including post contrast dynamic images through the pituitary fossa.

Findings:

The pituitary is normal in size, signal, and dynamic contrast enhancement. Apparent hypodensity seen on the left side of the gland on sagittal imaging represents partial voluming of the most aspect of the internal carotid artery. The infundibulum is midline. Optic chiasm, cavernous sinuses, and suprasellar region appear unremarkable. The remainder of the imaged brain (please note this study has been targeted to the pituitary, and as such the whole brain has not been imaged) appears unremarkable. 

Conclusion:

Normal examination.

Annotated image

Midline sagittal pituitary region anatomy

The pituitary (red dotted line) has an anterior (P) and posterior (*) parts, as well as the infundibulum (I), into which projectes the infundibular recess (IR) of the third ventricle. Note how close to the pituitary is the optic chiasm (green dotted line), above which is the supraoptic recess of the third ventricle. The mammillary bodies are posterior (yellow dotted line) separated from the infundibulum a very thin membrane forming the floor of the third ventricle (the site for third ventriculostomy). 

The pituitary fossa is bounded anteriorly and usually inferiorly (depending on the degree of pneumatization, by the sphenoid sinus, and posteriorly by the clivus. 

Annotated image

Coronal pituitary region anatomy

The pituitary gland (red line) and infundibulum (I) are seen immediately below the optic chiasm (green line). On either side is the cavernous sinus (yellow line) containing the internal carotid artery (orange). Below the gland is the sphenoid sinus. 

Case Discussion

This case demonstrates the normal anatomy and normal MRI appearance of the pituitary gland. 

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Case information

rID: 17529
Case created: 23rd Apr 2012
Last edited: 31st Jul 2017
Inclusion in quiz mode: Excluded

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