Oblique Facial Clefts

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Abstract
In a material of about 3600 [human] facial clefts, oblique clefts were observed (3.1 .permill.). The most frequent types were the medial oroocular and nasoocular clefts and their combinations. There were 2 atypical cases and 1 lateral oroocular variety. The oblique clefts were frequently associated with other types of clefts and/or more distant anomalies. No genetic, chromosomal or environmental factors were found to explain their etiology. Amniotic bands may be responsible for the severe malformations in 2 instances. The lacrimal apparatus was always involved to some degree with the exception of a few incomplete forms. In the alveolar arch, the clefts were situated between the medial incisor and the canine.

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