Nubbin sign (also called as cystic duct sign) is an important sign in a HIDA scan (cholescintigraphy using iminodiacetic acid analogues) that may be seen in cases of gallbladder neck obstruction. The "nubbin" refers to a small amount of radiotracer activity in the cystic duct, with absence of tracer in the gallbladder. It indicates lack of radionuclide uptake into gallbladder and therefore suggests acute cholecystitis.
- 1 . Fink-Bennett, Darlene. "Augmented cholescintigraphy: its role in detecting acute and chronic disorders of the hepatobiliary tree." Seminars in nuclear medicine. Vol. 21. No. 2. WB Saunders, 1991.