Frequency and location of pelvic phleboliths.

Pelvic phleboliths were demonstrated in 1000 subjects aged 16--79 years (mean 42.1, s.d. 12.7). They occurred in 44.2% of the subjects, in 37.3% of the males and 50.1% of the females. Among subjects between the ages of 35 and 54, phleboliths occurred more frequently in the females than in the males. In addition the older the subject the greater the number of phleboliths. Their distribution in the pelvic region was not symmetrical. They occurred more often on the left side than on the right. Of the 1582 phleboliths found, 643 were located on the right and 939 on the left. Their distribution suggests the possibility of an aetiology similar to that of other venous disorders.