What is a Non-Functioning Pituitary Adenoma (NFPA)?

Non-functioning pituitary adenomas are benign tumors of the pituitary gland that do not secrete excess hormones. Unlike functional adenomas (prolactinomas, GH-secreting, etc.), they are often discovered incidentally on brain imaging or when they grow large enough to cause mass effect symptoms.

Why do they matter?

• Mass Effect: As they enlarge, they can compress the optic chiasm, causing visual field defects (classically bitemporal hemianopia).
• Hypopituitarism: Large tumors can compress normal pituitary tissue, leading to deficiency of one or more pituitary hormones.
• Headache: Can cause persistent headache due to stretching of the sellar diaphragm.

Diagnosis:

• MRI Pituitary: Gold standard for detection and characterization.
• Visual Field Testing: Essential if the tumor abuts or compresses the optic chiasm.
• Full Pituitary Hormone Profile: To rule out subtle hormone secretion or hypopituitarism.

Treatment:

• Observation: Small tumors without visual compromise can be monitored with serial imaging.
• Surgery (Transsphenoidal): Indicated for tumors causing visual deficits or significant mass effect.
• Radiation: For residual or recurrent tumors after surgery.