I am a breast cancer survivor.  A little over a month ago my onc, after ordering a CT scan to diagnose the source of daily headaches, found a 2x2 cm mass behind my right eye.  Both the eye surgeon and oncologist thought it was malignant but a biopsy brought the good news that it is a hemangioma.  Unfortunately, it is not operable since it is tangled in the muscles of my eye along my nose.  It is also exerting some pressure on the optic nerve.  I have some lingering problems with blurry vision when I am tired and my sense of it is that the vision in that eye is not what it used to be--but it has always been my weak eye.  The eye is proptotic by 5 mm.

These are my questions.  At what point do they elect to do surgery?  My eye surgeon says orbital decompression is the only way to fix this.  I can see a difference in the way my eyes look, but then, I know it's there and I'm looking for it. It also feels different and is more sensitive to bright light, but that's more annoying than anything else.  I do get shooting pains in that eye.

Also---why is gamma knife therapy not applicable in this situation?

Thank you in advance for some answers.  Seems we always think of these things AFTER we leave the doc's office and I'm not due back for next follow up until December!