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 Mucosal melanosis and hamartomatous polyps are seen in? and explain in detail?
Ref: Harrison 19th ed., P 240* Peutz-Jeghers syndrome is characterized by dark brown spots on lips, buccal mucosa, nose and around eyes. There is concomitant intestinal polyposis. The most common location of polyps is in jejunum.* It is an autosomal dominant disorder with STK11 mutation.* The malignant potential of polyps ranges from never to rare transformation.