Is A

Congenital thumb abnormality

May Be Caused by

Angioma

Arteriovenous malformation

Diamond-Blackfan syndrome

Isolated anomaly

Klippel-Trénaunay-Weber syndrome

Lipoma

Macrodystrophia lipomatosa

Maffucci syndrome

Neurofibromatosis

Parkes Weber syndrome

Proteus syndrome

Triphalangeal thumb