May Be Caused by

Aneurysmal bone cyst

Aplasia cutis congenita

Arachnoid cyst

Arteriovenous malformation

Brain neoplasm

Brown tumor of hyperparathyroidism

Burr hole

Button sequestrum

Calvarial doughnut

Cholesteatoma

Chondroid lesion

Chondrosarcoma

Chordoma of clivus

Craniotomy flap

Cranium bifidum

Depressed skull fracture

Dermal sinus

Dermoid

Ectopic intradiploic glial tissue

Encephalocele

Enlarged emissary channel

Epidermoid

Ewing sarcoma

Fibrous dysplasia

Fontanelle

Fungal disease

Gaucher disease

Giant cell tumor

Glomus jugulare tumor

Hemangioma

Hydatid disease

Inioindineal canal

Langerhans cell histiocytosis

Leptomeningeal cyst

Lymphangioma

Lymphoma

Malignant fibrous histiocytoma

Melanotic neuroectodermal tumor of infancy

Meningioma

Meningocele

Metastasis to skull

Multiple myeloma

Nasopharyngeal carcinoma

Neurofibroma

Neurofibromatosis

Niemann-Pick disease

Osteolytic osteosarcoma

Osteomyelitis

Osteonecrosis of skull

Pacchionian granulation

Paget disease of bone

Paranasal sinus mucocele

Paranasal sinus neoplasm

Parietal foramen

Parietal thinning

Plasmacytoma

Rodent ulcer of scalp

Sarcoidosis

Scalp carcinoma

Sebaceous cyst

Skull fracture

Subdural hematoma

Surgical defect

Syphilis

Tuberculosis

Venous lake