May Be Caused by

Actinomycosis

Anemia

Arteriovenous malformation of dura

Bone flap

Calcified cephalohematoma

Chronic head-banging

Chronic osteomyelitis

Chronic scalp cellulitis

Coffin-Lowry syndrome

Dyke-Davidoff-Masson syndrome

Epidermal nevus syndrome

External occipital protuberance

Fibrous dysplasia

Frontometaphyseal dysplasia

Healing Langerhans cell histiocytosis

Hemangioma

Hyperostosis frontalis interna

Hyperparathyroidism

Hypoparathyroidism

Infantile fibrosarcoma

Ischemic necrosis

Lipodystrophy

Lymphoma

Mastocytosis

Meningioma

Mycetoma

Nail-patella syndrome

Ossified subdural hematoma

Osteoblastic metastasis

Osteoblastoma

Osteochondroma

Osteoma

Osteosarcoma

Paget disease of bone

Radiation osteonecrosis

Sickle cell disease

Sutural sclerosis

Syphilis

Treated brown tumor of hyperparathyroidism

Tuberculosis

Tuberous sclerosis