A 61-year-old male presents to your office with fever and dyspnea on exertion. He has been suffering from chronic, non-productive cough for 1 year. You note late inspiratory crackles on auscultation. Pulmonary function tests reveal an FEV1/FVC ratio of 90% and an FVC that is 50% of the predicted value. Which of the following would you most likely see on a biopsy of this patient's lung?
AArteriovenous malformations
BHyaline membranes
CCharcot-Leyden crystals
DSubpleural cystic enlargement
ELinear immunofluorescence along alveolar basement membranes
A 46-year-old woman comes to the physician with a 4-month history of lethargy. She has had joint pain for the past 15 years and does not have a primary care physician. Her temperature is 37.4°C (99.3°F), pulse is 97/min, and blood pressure is 132/86 mm Hg. Physical examination shows pallor of the oral mucosa and nontender subcutaneous nodules on both elbows. The distal interphalangeal joints of both hands are flexed and the proximal interphalangeal joints appear hyperextended. Range of motion in the fingers is restricted. The liver span is 6 cm and the spleen tip is palpated 4 cm below the left costal margin. Laboratory studies show: Hematocrit 33% Leukocyte count 1,800/mm3 Segmented neutrophils 35% Lymphocytes 60% Platelet count 130,000/mm3 Increased serum titers of which of the following is most specific for this patient's condition?
AAnti-U1-RNP antibody
BRheumatoid factor
CAntinuclear antibody
DAnti-CCP antibody
EAnti-Sm antibody
A 36-year-old man presents with increasing shortness of breath for a month, which is aggravated while walking and climbing up the stairs. He also complains of pain and stiffness in both wrists, and the distal interphalangeal and metacarpophalangeal joints of both hands. He was diagnosed with rheumatoid arthritis 6 months ago and was started on methotrexate with some improvement. He is a lifetime non-smoker and has no history of drug abuse. The family history is insignificant for any chronic disease. The blood pressure is 135/85 mm Hg, pulse rate is 90/min, temperature is 36.9°C (98.5°F), and the respiratory rate is 22/min. Physical examination reveals short rapid breathing with fine end-inspiratory rales. An echocardiogram is normal with an ejection fraction of 55%. A chest X-ray shows diffuse bilateral reticular markings with multiple pulmonary nodules. Which of the following is the most likely cause of this patient’s lung condition?
AIdiopathic pulmonary fibrosis
BCardiogenic pulmonary edema
CGranulomatous lung disease
DDrug-induced pulmonary disease
ERadiation-induced pulmonary disease
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