👉 Brachiocyllosis, also known as brachycyta, is a condition in which a person has two sets of opposite limbs. This can happen when one limb is longer than the other or when both are shorter than average. Brachycyta is often seen in children and adolescents, but it can affect anyone who has had a birth defect that affects their growth or development. Brachycyta can cause physical problems such as difficulty breathing, heart problems, and muscle