The spaghetti sign refers to the presence of a linear worm like filling defect within a contrast opacified bladder. This linear filling defect is considered to represent blood clot extruded from the ureter and thereby moulded in the tubular shape. It is seen in patients with gross haematuria. Presence of this sign is an indication of upper urinary tract bleeding.This finding can be appreciated on IVU (intravenous urogram), retrograde pyelography and CT in the excretory phase.
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