<prompt> The most common retrobulbar orbital mass in adults is -NeurofibromameningiomaCavernous haemangiomaSchwannoma  <response>: Ans. is c i.e., Cavernous hemangioma Cavernous hemangioma is the commonest benign orbital tumour among adults.The tumour is usually located in the retrobulbar muscle cone.It presents as a slowly progressing unilateral proptosis in the 2nd to 4th decade.Sometimes it may compress the optic nerve without causing symptoms. 