False about interstitial lung disease
**Core Concept**
Interstitial lung disease (ILD) refers to a group of disorders that primarily affect the interstitial spaces of the lung, leading to inflammation and fibrosis. This results in impaired gas exchange and can cause symptoms such as dyspnea, cough, and fatigue.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of ILD, which involves the deposition of collagen and other extracellular matrix proteins, leading to fibrosis and architectural distortion of the lung parenchyma. This can be seen on high-resolution computed tomography (HRCT) scans as reticular opacities, honeycombing, and traction bronchiectasis.
**Why Each Wrong Option is Incorrect**
**Option A:** ILD is not primarily caused by an infectious agent. ILD can be caused by a variety of factors, including autoimmune disorders (e.g., scleroderma), environmental exposures (e.g., asbestos), and idiopathic conditions.
**Option B:** ILD does not typically present with a sudden onset of symptoms. Symptoms of ILD often develop gradually over weeks to months, with a progressive decline in lung function.
**Option C:** ILD is not characterized by the presence of a significant pleural effusion. While pleural effusions can occur in some cases of ILD, they are not a hallmark feature of the disease.
**Option D:** ILD is not typically treated with corticosteroids alone. While corticosteroids may be used as part of the treatment regimen for some forms of ILD, other treatments such as immunosuppressive medications and pulmonary rehabilitation may also be necessary.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the diagnosis of ILD can be challenging, and a comprehensive diagnostic workup, including HRCT scans and lung function tests, is often necessary to establish a definitive diagnosis.
**Correct Answer:** D. ILD is not typically treated with corticosteroids alone.