Hypoplasia-Hyperplasia

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Munro and Lauritzen
Classification (1985)
The circle in Figure 1A designates the usual site of
skeletal involvement. The midsagittal, midincisor,
occlusal and orbital planes are designated.
Type IA, The craniofacial skeleton is only mildly
hypoplastic and the occlusal plane is horizontal;
Type IB, the skeleton is as in IA, but the occlusal
plane is canted. Type II, the condyle and part of the
affected ramus are absent; Type III, in addition to
the findings in Type II, the zygomatic arch and
glenoid fossa are absent; Type IV, This is an
uncommon type with hypoplasia of the zygoma
and medial and posterior displacement of the
lateral orbital wall; Type V, the most extreme type
has inferior displacement of the orbit with a
decrease in orbital volume.
(from McCarthy, J. G., Grayson, B. H., Coccaro, P.
J., Wood-Smith, D. Craniofacial microsomia. In
McCarthy J. G., ed. Plastic Surgery. Philadelphia:
W. B. Saunders, 1990.)
Clinical Findings
Jaws - The most obvious deformity is the mandible,
esp. ascending ramus, can be absent or reduced in
the vertical dimension.
Other skeletal components - the maxilla,
zygoma, temporal, orbit and cervical vertebrae may
be deformed and hypoplastic.
Muscles of mastication - hypoplastic
Ears - hypoplasia
Nervous system - hypoplasia and facial palsy
Soft tissue - clefts, hypoplasia of the skin, skin tags