<prompt> A patient presented with unilateral proptosis which was compressible and increases on bending forward. No thrill or bruit was present. MRI shows a retro orbital mass with enhancement. The likely diagnosis is -AV malformationsOrbital encephalocoeleOrbital varixNeurofibromatosis  <response>: Proptosis on bending forward is typical of intermittent proptosis. Orbital varices constitute about 90 of cases of intermittent proptosis. So, it is seen in venous malformation, i.e., orbital varixes not AV malformation.AV malformation carotid - cavernous fistula and encephalocele cause pulsatile exophthalmos. 