<prompt> A patient presented with unilateral proptosis which was compressible and increases on bending forward. No thrill or bruit was present. MRI shows a retroorbital mass with enhancement. The likely diagnosis is-AV malformationsOrbital encephalocoecleOrbital 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. AV malformation and encephalocele cause pulsatile exophthalmos. Ref: Hendersons orbital tumors 2nde p.404 