What is Muscle Cystic Fibrosis?

My younger sister was diagonas with Muscle Cystic Fibrosis and i was wondering if anyone can tell me what it means... if its deadly and information like that... any information would be helpful, thanks alot

Cystic fibrosis (CF) is a life-threatening disease that causes mucus to build up and clog some of the organs in the body, particularly in the lungs and pancreas. When mucus clogs the lungs, it can make breathing very difficult. The thick mucus also causes bacteria (or germs) to get stuck in the airways, which causes inflammation (or swelling) and infections that leads to lung damage.
Mucus also can block the digestive tract and pancreas. The mucus stops digestive enzymes from getting to the intestines. The body needs these enzymes to break down food, which provides important nutrients to help us grow and stay healthy. People with cystic fibrosis often need to replace these enzymes with capsules they take with their meals and snacks to help digest the food and get the proper nutrition.

I never heard of "muscle cystic fibrosis" and a Google search for that SPECIFIC term does not produce any meaningful results.

Check http://www.cff.org for any information you need on CF, but please be sure what it is your sister has before you panic.

No such thing I have cf myself!

never heard of "muscle cystic fibrosis" maybe a misunderstanding of what the doctor had said. i am an adult with CF and in my 38 + years i have never heard of that