May Be Caused by

 Common

Hematoma

Juvenile angiofibroma

Lymphoepithelioma

Lymphoma

Malignant neoplasm

Plasmacytoma

Rhabdomyosarcoma

 Uncommon

Amyloidosis

Arteriovenous malformation

Benign neoplasm

Chondrosarcoma

Internal carotid artery aneurysm

Lymphadenopathy

Metastasis

Osteosarcoma

Sarcoidosis

Sinus histiocytosis

Skull base meningioma

Transsphenoid encephalocele

Tuberculosis