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Influence of Scan and Pathologic Criteria on the Specificity of Cholescintigraphy: Concise Communication

William Beaumont Hospital, Royal Oak, Michigan
Veterans Administration Hospital, Ann Arbor, Michigan

Correspondence: For reprints contact: J. E. Freitas, MD, William Beaumont Hospital, Nuclear Medicine Dept., 3601 West 13 Mile Rd., Royal Oak, MI 48072.

ABSTRACT

The influence of scan and pathological criteria on the specificity of cholescintigraphy was assessed by a prospective study of 211 patients with suspected acute cholecystitis who underwent cholescintigraphy. Sufficient data were available in all to confirm a final diagnosis. Cholescintigraphy was performed in the standard fashion using 5 mCi of Tc-99m disofenin. Sixty patients had acute cholecystitis, 64 had chronic cholecystitis, and 87 had no demonstrable gallbladder disease. As the scan and pathological criteria for acute cholecystitis were varied from strict to liberal, the sensitivity of cholescintigraphy decreased (100% to 95.3%), the specificity increased (85.1 % to 98.6 %), and the predictive value increased (68.4 % to 96.8 %). The use of strict scan and pathological criteria for acute cholecystitis obscures the advantages that accrue from such early detection of acute cholecystitis by cholescintigraphy, and thus are to be avoided. To understand the disparate opinions voiced in the literature, an appreciation is required for the effects of changes in criteria on the specificity and predictive value of cholescintigraphy.