Most common cause of unilateral proptosis is -
Most common cause of bilateral proptosis: In children : Neuroblastoma and leukemia (chloroma). In adults : Thyroid ophthalmopathy. Most common cause of unilateral proptosis: In children : Orbital cellulitis. In adults : Thyroid ophthalmopathy. Ref: A. K. Khurana 6thE pg404
Thyrotoxicosis
Retinoblastoma
Intraocular haemorrhage
Raised intracranial tension
Diseases of orbit, Lids and lacrimal apparatus