<unk>  is due to a deficiency of calcium resulting in lack of mineralization and an overgrowth of costochondral joint cartilage. The calcium deficiency may be caused by rickets or other causes of calcium deficiency such as hypoparathyroidism.
Rachitic rosary
Band keratopathy
Tar melanosis
Bowenoid papulosis
Macular corneal dystrophy
Lattice corneal dystrophy
Granular corneal dystrophy
Exposure keratopathy