This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
All of the following childhood tumours cause proptosis except: September 2009 
Select and explain. 
A. Retinoblastoma, B. Metastatic neuroblastoma, C. Rhabdomyosarcoma, D. Leukemia
A: Retinoblastoma
Answer: A: Retinoblastoma 
Explanation: Ans. A: Retinoblastoma Causes of proptosis in children are: Orbital cellulitis Leukemia Optic nerve+-optic chiasm glioma Orbital rhabdomyosarcoma Metastatic neuroblastoma Plexiform neurofibromatosis Orbital haemangioma Metastatic Ewing's sarcoma Orbital dermoid cyst Lymphangiomas In adults the causes of proptosis are: Metastases from the breast, lung and GIT Cavernous hemangioma Mucoceles Lacrimal gland tumours Lymphoid tumours Meningiomas