Mercedes Benz sign Radiological sign, a triradiate radiolucent shadow, characteristic of the automobile maker's trademark. In case of Gallstones, radiolucent lines represent gas accumulation within the body of a calculus. Center of calculus may contract more than its periphery, which would result in the radial fissures. Gas in the fissures typically comprises < 1% O2, 6–8% Co2 & the rest nitrogen. This sign may also be seen in other conditions including subdural hematoma of the spinal cord, aortic dissection, ankle fracture, air embolism etc. Satyendra Dhar MD, @DharSaty #mercedesbenzsign #gallstones #triradiatesign
