You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A young adult presents with proximal weakness of upper limbs, features of facial palsy and winging of scapula. The most likely diagnosis is: and explain in detail?
Answer is A (Facio-Scapulo-Humeral Dystrophy): Weakness preferentially affecting the facial and shoulder girdle (proximal weakness of upper limb) together with winging of scapula in a young adult suggests a diagnosis of facio-scapulo-humeral dystrophy. Autosomal Dominant (Positive Family History(2) Abnormal gene 4q (4q35 deletion) Childhood to young adulthood (may be delayed to 5th decade) Mild 1st CPK (Normal Dystrophy)