A 32-year-old female nonsmoker is admitted with a 5-wk history of intermittent hemoptysis. She denies any sputum production, fever, or repeated infections. There is no history of contact with TB. On physical examination, the patient is afebrile; she has dullness on percussion and decreased breath sounds in the LLL zone posteriorly. CV exam is normal. PPD is 4-mm induration. Bronchoscopy shows a polypoid lesion paially obstructing the left lower lobe orifice. This lesion bled easily during the procedure. Bronchial washings are negative for malignancy and the biopsy is pending. Chest x-ray is shown below.What is the radiological diagnosis?