15th September 2020

A 65-year-old male presents with progressively worsening shortness of breath

A 65-year-old male presents with progressively worsening shortness of breath over the past few months. On examination, there are audible coarse crackles bilaterally. A chest X-ray was ordered which demonstrates lower zone fibrosis affecting both lungs. 

Which of the following is the most likely underlying pathology?

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