Spaghetti Sign

A term of art referring to the presence of elongated linear filling defects in the urinary bladder which correspond to blood clots that developed within the ureter due to transitional cell carcinoma, classically seen on excretory urography, less commonly by CT. The spaghetti sign in a patient with haematuria suggests that the site of bleeding is above the bladder
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They may be coiled and, if multiple, may completely fill the bile duct, which produces either the "spaghetti sign," or, if they are very densely packed in the bile ducts, may appear amorphous and manifest as hyperechoic pseudotumors.