The findings of ruptured hepatocellular carcinoma on helical CT

To evaluate the helical CT findings of ruptured hepatocellular carcinoma (H CC), 12 patients with ruptured HCC were reviewed with regard to the tumour' s location, size and contour protrusion, the appearance of the mass, the en hancement pattern, multiplicity and secondary changes. AII ruptured tumours were located at the periphery of the liver and had a protruding contour. T he maximum diameter of tumours ranged from 2 cm to 16 cm. Discontinuity of the hepatic surface was seen in 11 cases. In eight cases, CT images during the arterial phase showed a non-enhancing low attenuating lesion with focal discontinuity and peripheral rim enhancement. Seven cases showed separatio n of tumour content from the peripheral enhancing rim and intraperitoneal r upture of tumour content into the perihepatic space. Because of the similar appearance to an enucleated orbital globe with remaining sclera, this was termed the "enucleation sign". As well as ruptured masses, 10 cases with no n-ruptured masses also showed a nonenhancing low attenuating pattern. Seven cases showed a haematoma with high attenuation around the ruptured mass. T he peripheral location, protruding contour, discontinuity of the hepatic su rface and surrounding haematoma are helpful signs in the diagnosis of ruptu red HCC. The "enucleation sign" may be a characteristic finding in ruptured HCC.