O.M.E.N.S Classification of Hemifacial Microsomia

Area

Dysmorphic Severity

Orbital distortion

0 – Normal orbital size and position

1 – Abnormal orbital size

2 – Inferior or superior orbital displacement

3 – Abnormal orbit size and position

Mandibular hypoplasia

0 – Normal mandible

1 – Small mandible and glenoid fossa with short ramus

2 – Abnormally shaped and short ramus

3 – Absence of ramus and glenoid fossa (no TMJ)

Ear anomaly

0 – Normal auricle

1 – Mild hypoplasia and cupping with presence of all structures

2 – Absence of external canal with variable hypoplasia of conch

3 – Malpositioned lobule with absent auricle

Nerve involvement

0 – No facial nerve involvement

1 – Temporal or zygomatic branch involvement

2 – Buccal and/or mandibular and/or cervical branch involvement

3 – All branches affected

Soft tissue deficiency

0 – No soft tissue deficiency

1 – Minimal soft tissue deficiency

2 – Moderate soft tissue deficiency

3 – Severe soft tissue deficiency