42 year old gentleman with chronic productive cough for the last 5 years. The phlegm is white most of the time but may be greenish or yellowish occasionally.
What is your diagnosis?
This is a magnified version of the image:
Diagnosis: Cystic bronchiectasis
Bronchiectasis is a disease state defined by localized, irreversible dilation of part of the bronchial tree caused by destruction of the muscle and elastic tissue. It is classified as an obstructive lung disease, along with emphysema, bronchitis, asthma, and cystic fibrosis. Involved bronchi are dilated, inflamed, and easily collapsible, resulting in airflow obstruction and impaired clearance of secretions. Bronchiectasis is associated with a wide range of disorders, but it usually results from bacterial infections, such as infections caused by the Staphylococcus or Klebsiella species (Source).
Bronchiectasis on CT
Multicystic space within the base of the left lower lobe which is continuous with the small airways and is representative of cystic bronchiectasis (source).