A patient with retroviral infection presents with low-grade fever, cough, and one episode of hemoptysis. What is the most probable diagnosis based on the chest X-ray findings?

1. A

   Tuberculosis

2. B

   Pneumothorax

3. C

   Lung abscess

4. D

   Pulmonary metastasis

Appeared in: INI-CET EXAM -2025

Explanation

• The chest X-ray shows a thick-walled cavity with a distinct air-fluid level, which is the hallmark radiological feature of a lung abscess.
• A lung abscess is a localized collection of pus resulting from microbial infection and necrosis of lung tissue.
• Patients with compromised immune function, such as those with a retroviral infection, are at an increased risk for developing lung abscesses.
• The clinical presentation of fever, cough, and hemoptysis is consistent with the diagnosis of a lung abscess.

Why Other Options Were Wrong

• Option A: While tuberculosis (TB) is common in HIV patients and can cause lung cavities, TB cavities are typically thin-walled and located in the lung apices. A prominent air-fluid level, as seen in the image, is less characteristic of TB.
• Option B: A pneumothorax is the presence of air in the pleural space, causing lung collapse. The X-ray would show a visible pleural line and an absence of lung markings beyond it. These findings are not present in the image.
• Option D: Pulmonary metastasis typically appears as multiple, solid, well-defined nodules of varying sizes throughout the lungs. A single, large cavitary lesion with an air-fluid level is not a typical presentation of metastatic disease.

Related Visual

• Visual 1: Annotated X-ray - Highlighting the thick wall of the cavity and the clear air-fluid level to reinforce the key features of a lung abscess.
• Visual 2: Comparative Diagram - A side-by-side illustration showing the typical X-ray appearances of a lung abscess, a TB cavity, a pneumothorax, and pulmonary metastases to clarify the differences.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Interpretation of chest X-ray findings in an immunocompromised patient with respiratory symptoms to guide bedside assessment, documentation, and the next nursing action.
• Prompt identification of a lung abscess is crucial, especially in an immunocompromised patient, as it requires prolonged and aggressive antibiotic therapy to prevent complications like sepsis or empyema.
• Nursing care involves administering IV antibiotics, monitoring for response to treatment (e.g., resolution of fever, decreased sputum production), promoting postural drainage to clear secretions, and ensuring adequate nutrition for healing.
• What if? If the patient were not immunocompromised and had a history of alcoholism and poor dentition, the most likely cause would be aspiration of anaerobic bacteria from the mouth, and the treatment would target these organisms (e.g., with clindamycin).

How to Approach the Question

• First, analyze the clinical information provided: the patient is immunocompromised (retroviral infection) and has respiratory symptoms (fever, cough, hemoptysis).
• Next, systematically examine the chest X-ray. Identify the primary abnormality. In this case, it is a large cavity in the right lung.
• Look for specific features of the cavity: note the thick wall and the distinct horizontal line indicating an air-fluid level.
• Correlate the radiological findings with the clinical context. An infection is highly likely.
• Evaluate each option against the evidence. A thick-walled cavity with an air-fluid level is the classic sign of a lung abscess.
• Rule out the other options based on their typical radiological appearances, which do not match the image.

Concept Tested & Keywords

• Concept Tested: Interpretation of chest X-ray findings in an immunocompromised patient with respiratory symptoms.
• Stem keywords: retroviral infection, low-grade fever, cough, hemoptysis, chest X-ray
• Lead-in keywords: most probable diagnosis
• Clinical cues: The combination of a retroviral infection (immunocompromised state) and a cavitary lung lesion points towards an opportunistic infection.
• Clinical cues: The presence of an air-fluid level on the X-ray is a critical diagnostic clue.

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