<prompt> The most common retrobulbar orbital mass in adultsNeurofibromaMeningiomaCavernous haemangiomaSchwannoma  <response>: C i.e. Cavernous haemangioma The cavernous haemangioma is the most common benign orbital tumor in adultsQ, with a female preponderance of 70. Although it may develop anywhere in orbit, it most frequently occurs with in the muscle cone just behind the globeQ. 