What does an incomplete phocomelia birth defect entail?

Incomplete phocomelia is a type of limb deficiency characterized by the absence of portions of the limb while retaining some elements. In this condition, the central part of the limb is typically absent, but the proximal elements, such as the shoulder or hip, and the distal parts, like the hand or foot, are present. This results in a limb that may appear shortened or malformed, but with the hand or foot still attached.

This definition aligns precisely with what is classified as an incomplete phocomelia, making the choice regarding the central portion of the limb being missing with the hand still attached the correct answer.

This condition is distinct from complete phocomelia, where the entire limb might be missing, or from scenarios where only bones are absent. Additionally, having external digits is not a defining characteristic, as the focus of incomplete phocomelia is on the structure and attachment of limbs rather than the presence or absence of digits themselves.