Congenital hand: Episode 18- Triphalangeal thumb and the five fingered hand - Clearing the confusion

When there is an extra phalanx in the thumb, will it be called a 'triphalangeal' thumb, or will it be a 'five-fingered' hand? In other words, will it be considered a thumb or a finger? Time to put an end to this confusion! Let us learn about these entities and their management!