Delayed fontanelle closure
More common causes
Hypothyroidism
Osteomalacia
Syphilis
Down's syndrome
Less common causes
Rubella virus infection
Osteogenesis imperfecta
Achondroplasia
Rickets
Intracranial hypertension
Campomelic dysplasia
Uncommon causes
Cutis laxa
Wiedemann-Rautenstrauch syndrome
Kenny-Caffey-Linarelli syndrome