AbstractPrimary or stasis stones in the common duct are a distinct clinical, anatomical, and pathological entity. In the older patient with chills, fever, and jaundice, it is axiomatic that a primary or stasis stone will be found in a common duct that measures 20 mm or more in diameter. Furthermore, about 20% of such patients will not have stones in the gallbladder. The symptom of chills, having not been observed in patients with cancer of the head of the pancreas, is considered a diagnostic aid in the differentiation of jaundice secondary to common duct stones from jaundice due to malignant obstruction. The primary or stasis stone is the most common type of common duct stone. When present, a definitive operation, preferably choledochoduodenostomy, is advised. A simplified classification of biliary tract stones, preferably that of Aschoff, should be established as the universal standard. Also, based on this standard, worldwide prospective clinical studies should be initiated to obtain data for comparative evaluations to determine the true incidence of primary common duct stones.