The Correct Answer is D!

Knowledge to Practice, in collaboration with Mayo Clinic, offers online board review and lifelong learning products in Internal Medicine. With a full pre-assessment, you can identify the topics you’ve mastered and focus your time on topics where you need it the most. Our products are shown to help you learn 75% more in a quarter of the time when compared to more traditional methods.1


A 52-year-old male, current 75-pack-year smoker, is seen for acute dyspnea and right-sided chest pain. He denies fever, chills, sweats, cough, sputum production, or hemoptysis. Examination reveals diminished breath sounds throughout, right more than left. Chest x-ray and chest CT scan demonstrate scattered interstitial changes in the upper lung zones with cystic and nodular abnormalities in addition to a right-sided pneumothorax.

Which is the most likely diagnosis?

  1. Cystic fibrosis (CF)
  2. Idiopathic Pulmonary Fibrosis (IPF)
  3. Lymphangioleiomyomatosis (LAM)
  4. Langerhans’ cell histiocytosis (LCH)

1. Source: "Comparative Analysis of Pre/Post Assessments of Live/Didactic Course Attendees when compared to Mico-Learning/Online Course Users., "Knowledge to Practice, 2017.