May Be Caused by

 Common

Aneurysmal bone cyst

Battered child syndrome

Enchondroma

Fracture

Hemangioma

Langerhans cell histiocytosis

Lymphangioma

Osteochondroma

 Uncommon

Bone cyst

Brachial plexus injury

Caffey disease

Erb palsy with disuse

Ewing sarcoma

Fibrous dysplasia

Glenohumeral joint arthritis

Klippel-Feil syndrome

Leukemia

Lymphoma

Malignant fibrous histiocytoma

Metastasis

Osteomyelitis

Sarcoma

Sprengel deformity

Syringomyelia