If a ct scan showed that i have bone cancer, but the hospital, doctor, nor radiologist informed me or my doctor and have proof, do i have a case?

i went to the E.R for abdominal pain in sept. 2011 the doctor ordered a ct scan to see what the problem was,they told me that i had diverticulitus. they treated me for it and sent me home. they also told me that they would contact me if there was anything more of concern. they also said that they would send a report to my doctor. anyway, this january i was seen again in the same e.r with the same pain, so my doc ordered another ct scan. they informed me that i had diverticulitus again and that i also have litic lesions on my bones. they told me that i was very sick and kept me in the hospital. several tests were ran and they compared the ct scan from sept.11 to the one they did in jan. and mentioned that the cancer had doubled in size and we werent even aware that there was cancer nor was my primary doc. other doctors that i have talked to have said that it could have been slowed down alot sooner with treatment if i would have known sooner.