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An octreotide scan is a type of SPECT scintigraphy used to find carcinoid, pancreatic neuroendocrine tumors, and to localize sarcoidosis. It is also called somatostatin receptor scintigraphy (SRS). Octreotide , a drug similar to somatostatin , is radiolabeled with indium-111 , [ 1 ] and is injected into a vein and travels through the bloodstream.
Octreotide is used for the treatment of growth hormone producing tumors (acromegaly and gigantism), when surgery is contraindicated, pituitary tumors that secrete thyroid-stimulating hormone (thyrotropinoma), [citation needed] diarrhea and flushing episodes associated with carcinoid syndrome, and diarrhea in people with vasoactive intestinal peptide-secreting tumors ().
68 Ga DOTA-TATE (gallium-68 dotatate, GaTate) is used to measure tumor SSR density and whole-body bio-distribution via PET imaging. [11] [12] 68 Ga DOTA-TATE imagery has a much higher sensitivity and resolution compared to 111 In octreotide gamma camera or SPECT scans, due to intrinsic modality differences. [11]
Thus, octreotide scanning for NET tumors is being increasingly replaced by gallium-68 DOTATOC scan. [65] Imaging with fluorine-18 fluorodeoxyglucose (FDG) PET may be valuable to image some neuroendocrine tumors. [66] This scan is performed by injected radioactive sugar intravenously. Tumors that grow more quickly use more sugar. Using this scan ...
The natural somatostatin receptor ligand, the 14 amino acid peptide somatostatin (A), was abridged to the biologically more stable 8 amino acid peptide Octreotide (OC, B). Introduction of a tyrosine into the 3rd position of the Octreotide sequence resulted in Tyr3-Octreotide (TOC, C), which allows for iodination of the tyrosine residue with the ...
From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Octreotide scan; Retrieved from " ...
Edotreotide (USAN, also known as (DOTA 0-Phe 1-Tyr 3) octreotide, DOTA-TOC, DOTATOC) is a substance which, when bound to various radionuclides, is used in the treatment and diagnosis of certain types of cancer. [3] When used therapeutically it is an example of peptide receptor radionuclide therapy.
When seen in a scan, the GSV and the Giacomini vein, together with the accessory saphenous vein (ASV), form an image resembling an eye which is referred to as the "eye sign" or "eye image". [ 33 ] All veins which are between the skin and the superficial fascia are tributaries, and all veins which cross the deep fascia to join the deep venous ...