20th February 2025

A 42-year-old man is referred to respiratory clinic due to worsening shortness of breath and non-productive cough.

A 42-year-old man is referred to respiratory clinic due to worsening shortness of breath and non-productive cough. He does not suffer from any other medical conditions and does not take any regular medications. 

Chest examination reveals crackles in both apices. CXR shows bilateral apical fibrosis.

What is the most likely underlying diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.