My friend, I understand your concerns. Please don't think I am trying to discourage you. You should understand the realities.
This happened a while ago, may be five years back..I knew one family of three sisters and one brother, all well qualified and experienced applied to CIC for immigrating to Canada. All their applications got approved at the same time within six months. One of the sisters disclosed that she had undergone cancer therapy (Masectomy) during her medical exam. Though she had passed that medical exam in her home country, CIC did not approve her case at the final stage. She could not make it to Canada with her other siblings and stayed back with her mother.
So it is hard to predict what CIC will do when Medical results are reviewd at the final stage especially if one has medical history.
Be positive. If I were in your position "I will hope for the best from CIC and prepare for the worst".
Good luck