<prompt> A child presents with unilateral propotosis which is compressible and increases on bending forwards. It is non-pulsatile and has no thrill or bruit. MRI shows retroorbital mass with ecogenic shadows with enhancement. The most probable diagnosis is:NeurofibromatosisOrbital varixOrbital A-V fstulaOrbital encephalocele  <response>: B i.e. Orbital varix 