👉 Hyperbrachycrania, also known as "twin brachycephalic syndrome," is a rare genetic disorder that affects the brain and facial structure. It occurs when there are two identical faces or brachycephalic structures on either side of the head, including the eyes, which can cause difficulties with vision, speech, and coordination. The exact causes of hyperbrachycrania are not fully understood, but it is thought to be a result of mutations in genes that