A<unk>  may refer to a groove in the anal canal wall, which can occur after posterior midline fissurectomy or fistulotomy (surgical operations involving the anal canal), or with lateral internal anal sphincter<unk> s. The<unk>  is associated with minor degrees of fecal incontinence, allowing seepage of liquid stool or mucus.
Keyhole defect
Craniofacial cleft
Cranioschisis
Rachischisis
Hemifacial microsomia
Condylar hypoplasia
Pachydermoperiostosis
Oroantral fistula