Microform holoprosencephaly is a benign form of holoprosencephaly (HPE; see this term) characterized by midline defects without the typical HPE defect in brain cleavage.

Pterygium colli is a congenital skin fold that runs along the sides of the neck down to the shoulders. It involves an ectopic fibrotic facial band superficial to the trapezius muscle. Excess hair-bearing skin is also present and extends down the cervical region well beyond the normal hairline.