TABLE 1

Currently Available Endoscopic and Anatomic-Imaging Techniques for GEP NET Investigation

Characteristic	TAUS	EUS	Video capsule	CT^*	MRI^*
Use	Detection of primary GI NET (solid organs only)	Detection of gastric, duodenal and rectal primary NETs; diagnostic biopsy	Detection of esophageal, gastric, duodenal, and small-bowel primary NETs	Staging and follow-up (first-choice modality); identification of primary site; evaluation of local extent; assessment of metastases	Detection and assessment of liver metastases (first-choice modality)
Sensitivity	Limited; high interoperator variability	High	Moderate	Can be enhanced by enterography and enteroclysis	High for bone marrow metastases; can be enhanced by enterography and enteroclysis
Radiation exposure	No	No	No	Yes	No
Other	Is widely available	Is invasive	Can analyze entire bowel	Is widely available	Uses gadolinium chelate, which is safer than CT iodine agents as regards allergic reactions and nephrotoxicity