Functional NET
A neuroendocrine tumor that produces clinically significant amounts of hormones causing recognizable symptoms.
Full Definition
A functional neuroendocrine tumor (NET) is one that secretes biologically active hormones or peptides in sufficient quantities to produce clinical symptoms. Examples include insulinomas causing hypoglycemia, gastrinomas causing Zollinger-Ellison syndrome, and VIPomas causing watery diarrhea. These tumors are distinguished from non-functional NETs, which may produce hormones but not in clinically significant amounts. The diagnosis requires correlation between elevated biochemical markers and corresponding clinical symptoms. Treatment often focuses on both tumor control and symptom management through hormone suppression.
Usage
Usage note: Distinguish clearly from 'non-functional' - hyphenate when used as compound adjectives.
In Context
- "The patient presented with a functional NET of the pancreas causing severe hypoglycemic episodes." — Case presentation
- "Biochemical testing confirmed this was a functional NET with elevated gastrin levels and positive secretin stimulation test." — Diagnostic workup