Radiographs of the proband's chest and skull demonstrating the complete absence of bilateral clavicles, open large fontanelles, multiple wormian bones, supernumerary teeth, and mandibular protrusion (A-C). Anteroposterior radiograph of the father's chest demonstrating bilateral absence of clavicles (D) and radiographs of his skull demonstrating multiple wormian bones, a relatively thick skull and prognathism (E, F).