## **Core Concept**
The Garland sign, also known as the "Garland's triad," is a radiological finding seen on chest X-rays (CXR) that is associated with sarcoidosis. Sarcoidosis is a systemic granulomatous disease that can affect multiple organs, including the lungs and lymph nodes. The Garland sign refers to the enlargement of lymph nodes in the right paratracheal, left paratracheal, and right hilar regions.

## **Why the Correct Answer is Right**
The Garland sign involves the right paratracheal (station 2R), left paratracheal (station 2L), and right hilar (station 10R) lymph nodes. This triad of lymph node enlargement is characteristic and helps in the diagnosis of sarcoidosis, among other conditions that cause lymphadenopathy. The correct answer involves identifying which option does not belong to the classic description of the Garland sign.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Involvement of right paratracheal lymph nodes is part of the Garland sign.
- **Option B:** Involvement of left paratracheal lymph nodes is also part of the Garland sign.
- **Option C:** Involvement of right hilar lymph nodes is a component of the Garland sign.
- **Option D:** This option would represent the one that does not fit with the classic Garland sign description, which typically includes right paratracheal, left paratracheal, and right hilar lymph nodes.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while the Garland sign is suggestive of sarcoidosis, it is not pathognomonic. Sarcoidosis can present with lymphadenopathy in various patterns, and the Garland sign is one of the classic presentations. The diagnosis of sarcoidosis requires correlation with clinical findings, laboratory results, and sometimes histopathological confirmation.

## **Correct Answer: D.**