Citation, DOI & article data
Bell, D., Mehrabinejad, M. Filling defect. Reference article, Radiopaedia.org. (accessed on 30 Jun 2022) https://doi.org/10.53347/rID-75486
A filling defect is a general term used to refer to any abnormality on an imaging study which disrupts the normal opacification (filling) of a cavity or lumen. The opacification maybe physiological, for example, bile in the gallbladder or blood in a dural venous sinus, or maybe due to the installation of contrast medium, for example within a vessel, as part of a CT angiogram, within the bladder, during a cystogram, etc.
CT pulmonary angiogram: PE in the pulmonary artery interrupts normal contrast opacification of the vessel
CT colonogram: polyp in the colon prevents the normal gas and contrast filling of the bowel
MRCP: calculus in the common bile duct leaves a focus of low signal in the duct
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