**Question:** Features of Peutz-Jeghers syndrome are all except

A. Polyposis in the gastrointestinal tract
B. Macules or moles on the skin
C. Abnormal liver function tests
D. Breast cancer

**Core Concept:**
Peutz-Jeghers syndrome (PJS) is a rare genetic disorder characterized by the presence of mucocutaneous pigmentation (moles or macules) and hamartomatous polyps in the gastrointestinal tract. These polyps, also known as Peutz-Jeghers polyps, are benign growths that can lead to gastrointestinal bleeding, obstruction, or perforation if large in size.

**Why the Correct Answer is Right:**
The correct answer is D. Breast cancer, as it is not a feature of Peutz-Jeghers syndrome. In fact, breast cancer is rare in individuals with PJS, and the overall risk of breast cancer is lower compared to the general population. However, breast cancer can still occur, but it is not a defining feature of the syndrome.

**Why Each Wrong Option is Incorrect:**
A. Polyposis in the gastrointestinal tract is a defining feature of Peutz-Jeghers syndrome and is included in the correct answer.
B. The presence of macules or moles on the skin is not a feature of PJS but is a correct answer choice (A).
C. Abnormal liver function tests are not a feature of Peutz-Jeghers syndrome and are not considered in the correct answer options.

**Clinical Pearl:**
Peutz-Jeghers syndrome is an example of a polyposis syndrome, which is a group of disorders characterized by the development of multiple polyps in different organs (e.g., colorectal polyps, breast polyps, etc.). This syndrome is caused by mutations in the LKB1 gene, which is responsible for regulating cell growth and differentiation. The gastrointestinal polyps can lead to complications like obstruction or bleeding, while the skin lesions are cosmetic concerns for patients. Early detection and regular surveillance are important to manage complications effectively.