All are cavitating lesions in the lungs, except?
Answer is B (Hamaoma): Hamaomas produce non cavitating popcorn calcifications. Malignant lesions (squamous cell carcinoma) and granulomatous lesions (Wegener's granulomatosis, Caplan's syndrome) are established causes of cavitatory lesions.
Caplan's syndrome
Hamaoma
Wegner's granuloma
Squamous cell carcinoma