The 5-F rule refers to risk factors for the development of cholelithiasis in an event of upper abdominal pain:
fair: more prevalent in Caucasian population 1
fat: BMI >30
fertile: one or more children
forty: age ≥40
cholelithiasis can occur in young patients with a positive f...
The 5-tier ACR system was a previously used system for classification of radiologic breast findings, proposed by the American College of Radiologists (ACR). It is no longer in widespread use, having been gradually superseded by the new 6-tier BIRADS classification system first published in 1992....
The 5th metacarpal pit refers to the normal exaggeration of the pit-like depression in the head of fifth metacarpal.
It should not be mistaken for a fracture (old or new) or an erosion.