about
25 percent of uc patients have a relative with a similar condition (uc, crohn's, ibs).
Crohn's is patchy in appearance (areas of normal tissue, followed by inflamed tissue, followed by normal, repeat), biopsies would show deep tissue damage, and inflammation can be anywhere in the digestive tract from mouth to anus. Uc always starts at the rectum and spreads continuously upward, biopsies show very shallow tissue damage, and it's limited to just the large intestine. There's also crohn's-colitis and indeterminate-colitis (both crohnic) for cases where it's inconclusive, exactly what it is. I'm not sure what your doctor saw during the colonoscopy, but that might add more certainty to a diagnosis.
My recommendation is proceed with the prednisone and asacol. You might want to add a meslamine suppository (canasa) or enema (rowasa) as much of your inflammation is near your anus, and the pills don't reach that far, consistently. If it doesn't improve things, then insist on an antibiotic as you might have infectious colitis which could respond to antibiotics and not the stuff you're currently taking...a misdiagnosis might be possible given the inconclusive pathology. But even that'd be great news, as you might not have a chronic, lifelong disease, after all, at least in that situation