The easiest way to diagnose a bone tumor is by 'Aunt Minnie' ; i.e., if you have seen it before, you can diagnose it. It works, may be in less than 50% of cases in day to day practice. It is because very few bone tumors have a nearly pathognomonic appearance and usually there are 2-3 differentials.
The 'AuntMinnie' tachnique will also not work if the bone tumor has an atypical appearance, but located at a typical site or if it is situated in an atypical site although the appearances are typical.
When 'AuntMinnie' does not work (or even when it works), the way to arrive to a reasonalble diagnosis is by pattern recognition.
(to be contd...)