Cardiopulmonary
Kyphoscoliosis causing restrictive lung disease
Pneumonia
Cor pulmonale
Tricuspid regurgitation
Aortic root dilation
Left ventricular hypertrophy
Neurological
Hydrocephalus
Basilar Invagination (headache, dysphagia, ataxia)
Osteogenesis imperfecta
Child abuse
Myositis ossificans
Primary juvenile osteoporosis
Ehlers-Danlos syndrome
Hypogonadism
Paget's disease of bone
Malignancy