Pelvic calcification consistent with phleboliths is the most common type of calcification found in the pelvis, affecting approximately 35 percent of people over 40 years old, according to Northwestern Health Sciences University. Phleboliths are oval or round and measure between 2 and 5 millimeters in diameter.
Phleboliths are associated with chronic constipation because straining while passing a stool may eventually lead to thrombosis, which can then calcify, indicates NHSU. This type of pelvic calcification is not considered medically significant.
Typically, phleboliths are found near the ischial spine. The location is one indicator physicians use to differentiate phleboliths from ureteral stones, advises NHSU. Commonly, phleboliths have radiolucent centers with no spaces in the walls. These features assist doctors in diagnosing them as phleboliths and not cystic or arterial calcifications.