There is a lot of confusion about uctd which is simply a diagnosis of an autoimmune syndrome that is not definite. Over time it will often morph into a clear diagnosis of one disease or another but more often something like MCTD which usually includes symptoms of polymyositis or dermatomyositis, sle lupus, and scleroderma. It can also include symptoms of other AI diseases like RA.
I have mctd which presented with lupus symptoms and then polymyositis and can accurately say I have both diseases. Scleroderma has never been an issue fortunately and I know many others with mctd whose presentation, progression and symptoms are quite different.
Just means your immune system is seriously misdirected and likes more than one target in your body. In order to have a diagnosis of mctd the anti rnp antibody has to eventually show up but is often negative in tests in earlier stages.
Keep in mind that lupus, ra, myositis, scleroderma are all connective tissue diseases and having a combination of symptoms just means you have an overlap condition or syndrome.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.