Symphalangism, distal, with microdontia, dental pulp stones, and narrowed zygomatic arch is a condition that affects the teeth and the joints in the hands. In this condition, the joints in the middle of the fingers are joined together, causing the fingers to look like they are stiff and crooked. This usually also results in stiffness of the fingers. Other symptoms include short nails that have ridges, short and underdeveloped fingers, shorter toes, and some finger bones that are missing. Individuals may also have small pieces of bone that collect in the center of tooth tissue (dental pulp stones), small teeth (microdontia), narrow cheekbones (narrowed zygomatic arch), and missing wrist bones.
Symphalangism, distal, with microdontia, dental pulp stones, and narrowed zygomatic arch is thought to be a genetic disorder, but it is unknown which gene causes it or how it is passed from parent to child. Similar disorders, including distal symphalangism and brachydactyly, are passed from parent to child in an autosomal dominant manner. Autosomal dominant means an individual only needs one copy of the changed gene or mutation in order to have the condition. If a parent is affected by this condition, each of their children have a 50/50 chance of also having the condition.
If you or a family member has been diagnosed with symphalangism, distal, with microdontia, dental pulp stones, and narrowed zygomatic arch, talk with your doctor about the most current treatment options. Support groups are also good resources of support and information.
Description Last Updated: Feb 15, 2018