Pruzansky I is the most minor example of hemifacial microsomia, characterized by:
Mandible A small mandibular ramus but with all the anatomy of the ramus easily distinguishable.
TMJ Present and intact.
Occlusion The dental occlusion is generally class I without an occlusal cant.
In addition to the above, the following may be found:
Ear Every range of ear presentation is possible from a completely normally shaped and positioned external ear with normal middle ear and inner ear structures and normal hearing all the way through to complete anotia with conduction hearing loss.
Orbit The position of the orbit and the eye on the affected side can be normal but varying degrees of vertical and horizontal dystopia can occur. Microphthalmia and anophthalmia can also occur.
Soft tissues It is rare for the soft tissues to be significantly deficient in Pruzansky I cases.
Facial nerve It is rare for the facial nerve to be significantly affected in Pruzansky I cases.