Following statements about sarcoidosis is false
## Core Concept
Sarcoidosis is a **multisystem granulomatous disease** characterized by the formation of non-caseating granulomas in various organs, most commonly the lungs and lymph nodes. The etiology of sarcoidosis remains unknown, but it is believed to result from a combination of genetic and environmental factors. The disease can manifest with a wide range of symptoms, depending on the organs affected.
## Why the Correct Answer is Right
To accurately determine why the correct answer is right, the specific statements about sarcoidosis provided in options A, B, C, and D are needed. However, in the context of common knowledge about sarcoidosis:
- Sarcoidosis often presents with **pulmonary symptoms** such as cough and dyspnea.
- It can cause **hypercalcemia** due to increased vitamin D production by activated macrophages within granulomas.
- **Non-caseating granulomas** are a hallmark of the disease.
## Why Each Wrong Option is Incorrect
Without the specific details of each option, we can still discuss general misconceptions about sarcoidosis:
- **Option A:** If a statement claims sarcoidosis only affects the lungs, it would be incorrect because while the lungs are commonly involved, sarcoidosis can affect any organ, including the skin, eyes, and lymph nodes.
- **Option B:** If a statement suggests that caseating granulomas are characteristic of sarcoidosis, it would be incorrect because sarcoidosis is defined by the presence of **non-caseating** granulomas.
- **Option C and D:** Similar analysis would depend on the content of these options.
## Clinical Pearl / High-Yield Fact
A key point to remember is that **sarcoidosis can cause hypercalcemia**. This occurs because **1,25-dihydroxyvitamin D (calcitriol)** is produced by macrophages within the granulomas, leading to increased absorption of calcium from the intestine and its subsequent elevated levels in the blood.
## Correct Answer: D.