Diagnosis of acute cholecystitis by cholescintigraphy: significance of pericholecystic hepatic uptake.

Uptake of radionuclide by the liver next to the gallbladder in cholescintigraphy has been described as a useful secondary sign with a high positive predictive value for the diagnosis of acute cholecystitis. We retrospectively examined 780 consecutive cholescintigrams to (1) determine the positive predictive value at 1 hr of this sign for acute cholecystitis and (2) ascertain if the presence or absence of this finding could differentiate acute from gangrenous cholecystitis. Pericholecystic hepatic activity was present at 1 hr in 48 (34%) of 141 scans in which the gallbladder was not visualized, and cholecystectomy was performed within 6 days of scintigraphy. Forty-five of these patients had acute and three had chronic cholecystitis (94% positive predictive value for acute cholecystitis). In addition, 57% of patients with gangrenous cholecystitis exhibited pericholecystic hepatic activity, and the frequency of this finding was significantly higher (p less than .006) in gangrenous than in acute cholecystitis. In summary, pericholecystic hepatic uptake is a valuable secondary sign in the cholescintigraphic diagnosis of acute cholecystitis. The significance of the finding is (1) a high positive predictive value for acute disease at 1 hr and (2) a statistically significant increased frequency in patients with gangrenous cholecystitis.