Question 1

Miliary distribution of scattered radiopacities within the lung is seen with hematogenous spread of tuberculosis, as well as infection with __________.

Accepted Answer

Miliary tuberculosis is characterized by the hematogenous spread of Mycobacterium tuberculosis, leading to numerous small nodular shadows (resembling millet seeds) throughout the lungs. Varicella-zoster virus, the cause of chickenpox and shingles, can also disseminate hematogenously in immunocompromised individuals, causing a similar miliary pattern on chest radiographs. The other options listed do not typically cause a miliary pattern on imaging.

Question 2

Scarring in the lung apices is most commonly seen with which of the following diseases?

Accepted Answer

Scarring in the lung apices is a common finding in postprimary tuberculosis, which is the reactivation of latent tuberculosis. Primary tuberculosis may also cause scarring but it is more commonly seen in postprimary tuberculosis. Cryptococcus neoformans and Histoplasma capsulatum infections typically do not cause scarring in the lung apices.

Question 3

Which of the following infectious organisms would be the most likely underlying cause for bilateral perihilar, ground glass radiographic densities within the lungs of a feverish patient with acquired immune deficiency syndrome (AIDS)?

Accepted Answer

Bilateral perihilar, ground glass radiographic densities within the lungs are consistent with the classic presentation of Pneumocystis carinii pneumonia (PCP), which is a common opportunistic infection in patients with AIDS. The other organisms listed do not typically produce this radiographic pattern in patients with AIDS.

Question 4

Miliary nodules widely scattered throughout the lungs are the result of which of the following routes of spread of tuberculosis?

Accepted Answer

Widely scattered miliary nodules in the lungs are a classic manifestation of hematogenous spread of tuberculosis, in which the bacilli spread through the bloodstream and infect multiple areas of the body, including organs like the lungs. The other routes mentioned - bronchogenic, aspiration, and inhalation - all involve direct spread of bacilli into the lungs, rather than hematogenous spread, and would not result in multiple widely-scattered nodular lesions.

Question 5

Perihilar lymph node calcification and peripheral parenchymal granuloma, residual of primary tuberculosis, represent the __________.

Accepted Answer

Perihilar lymph node calcification and peripheral parenchymal granuloma are characteristic findings of the Ranke complex, which is a residual lesion of primary tuberculosis. The target calcification sign is a finding on CT scans that is associated with fungal infections. The Ghon focus is a primary tuberculosis lesion that occurs in the lung. Gumma is a soft, non-cancerous growth resulting from the tertiary stage of syphilis.

Question 6

Pneumonia, radiographically presenting as extensive, bilateral, ill-defined opacities in the lower lobes with pleural effusion, in a HIV patient on a ventilator is likely resultant from which of the following infectious organisms?

Accepted Answer

Pseudomonas aeruginosa is an opportunistic pathogen commonly associated with pneumonia in immunocompromised individuals such as those with HIV, and is known to cause extensive, bilateral, and poorly defined infiltrates on chest radiographs. The presence of pleural effusion also suggests a bacterial etiology. Haemophilus influenzae and Actinomyces israelii are not commonly associated with pneumonia in immunocompromised individuals. Mycobacterium tuberculosis typically presents with more upper lobe involvement and usually has a more slow and indolent course of progression.

Question 7

Chronic involvement of the mediastinum with Histoplasma capsulatum infection may lead to __________.

Accepted Answer

Chronic involvement of the mediastinum with Histoplasma capsulatum infection may lead to fibrosing mediastinitis.

Question 8

Which of the following types of pneumonia results from inflammatory exudate in the periphery of the lung spreading circumferentially through pores of Kohn and canals of Lambert to eventually involve an entire lobe resulting in a homogenously radiodense regional lung?

Accepted Answer

Lobar pneumonia is characterized by the involvement of a large and continuous area of a lobe of the lung, often with consolidation and uniformity in appearance on a radiograph, which matches the description given.

Question 9

Aspiration pneumonia most commonly involves the __________ in a supine patient.

Accepted Answer

In a supine patient, aspiration pneumonia most commonly involves the superior segment of the lower lobes due to the anatomical position and the effect of gravity on aspirated material.

Question 10

Which of the following is the most likely radiographic presentation of primary tuberculosis?

Accepted Answer

Primary tuberculosis typically presents with lymphadenopathy and parenchymal consolidation on radiographic imaging.

Question 11

Mediastinal and hilar lymphadenopathy in a patient with arthralgias who recently returned from extensive hiking in the Southwest United States raises the question of infection by which of the following organisms?

Accepted Answer

The patient's history of extensive hiking in the Southwest United States suggests exposure to Coccidioides immitis, a dimorphic fungus endemic to the region that can cause pulmonary infection and mediastinal/hilar lymphadenopathy. Pneumocystis carinii and Cryptococcus neoformans can also cause respiratory infections in immunocompromised patients, but they are not typically associated with lymphadenopathy. Echinococcus granulosis, a tapeworm commonly found in dogs and farm animals, causes liver or lung cysts, but not mediastinal/hilar lymphadenopathy.

Question 12

Which of the following infections results from inhalation of contaminated dust, with the most common radiographic appearance as a single well-defined nodule or mass?

Accepted Answer

Cryptococcus neoformans is a fungus that can be inhaled from contaminated dust, often from bird droppings, and can cause a single well-defined nodule or mass in the lungs, visible on radiographic imaging.

Question 13

Reinfection tuberculosis produces a progressive infection with predilection for involvement of the __________.

Accepted Answer

Reinfection tuberculosis typically produces an infection with a predilection for involvement of the apical segments of the upper lobes.

Question 14

Which of the following infectious organisms would likely account for patchy peripheral densities with rapid progression to involve the entire lobe, as well as pleural effusion within an industrial worker specializing in humidifier maintenance?

Accepted Answer

The patchy peripheral densities with rapid progression to involve the entire lobe and pleural effusion are consistent with Legionella pneumophila, which can cause a severe form of pneumonia known as Legionnaires' disease. This organism is commonly associated with water systems, such as cooling towers and humidifiers, making it a likely pathogen for an industrial worker specializing in humidifier maintenance. Pseudomonas aeruginosa and Klebsiella pneumoniae can also cause pneumonia, but they typically do not present with patchy densities and rapid progression. Mycoplasma pneumoniae may cause pneumonia, but it typically does not cause pleural effusion.

Question 15

Pneumonia related to infection with which of the following organisms would be most likely to demonstrate air bronchograms on chest radiographs?

Accepted Answer

Air bronchograms are more commonly seen in lobar pneumonia, which is typically caused by Streptococcus pneumoniae. Mycobacterium pneumoniae can also cause lobar pneumonia but is less likely to present with air bronchograms. Histoplasma capsulatum is a fungal infection that typically presents with interstitial pneumonia, while Bacillus anthracis is associated with hemorrhagic pneumonia.

Question 16

Which of the following is associated with chronic granulomatous disease characterized by caseating granulomas or pneumonia?

Accepted Answer

Chronic granulomatous disease (CGD) is a disorder of the immune system that causes an inability to fight off certain bacterial and fungal infections, leading to the formation of granulomas. Pulmonary tuberculosis is a bacterial infection that often leads to the formation of granulomas in the lungs. Therefore, pulmonary tuberculosis is associated with CGD. Varicella-zoster, Histoplasma capsulatum, and Cryptococcus neoformans are also associated with infections that can cause granulomas, but they are not typically associated with CGD.

Question 17

A calcified region of parenchymal involvement with tuberculosis is known as a __________.

Accepted Answer

A Ghon focus is a calcified lesion in the lung caused by tuberculosis. It consists of a small area of caseous necrosis (dead tissue) in the lung, usually in the lower part of the upper lobe or the upper part of the lower lobe, along with nearby enlarged lymph nodes. When a Ghon focus and its associated lymph nodes are seen together, they are called a Ranke complex. A broncholith is a calcified piece of material that has come from a nearby bronchus and lodged in the lung. A hamartoma is a benign lung tumor made up of an abnormal mixture of lung tissues.

Question 18

Which of the following infectious diseases is most life-threatening?

Accepted Answer

Pneumonia is the most life-threatening infectious disease out of the given options as it can cause severe inflammation and infection in the lungs, potentially leading to respiratory failure and death. Lung abscess and empyema are both serious conditions but may have a lower risk of mortality compared to pneumonia. Calcified hilar lymphadenopathy is not an infectious disease but a radiological finding that may indicate a past infection such as tuberculosis.

Question 19

An alcoholic patient presents with cough, fever and abundant amounts of foul smelling, purulent sputum. Which of the following is most likely represented on a PA chest radiographic examination showing an air-fluid level within the right upper lung?

Accepted Answer

The clinical presentation of cough, fever, and foul-smelling, purulent sputum is consistent with a lung abscess. The presence of an air-fluid level within the right upper lung on chest radiography further supports this diagnosis. Cavitation is a common feature of lung abscesses and is represented by an air-fluid level on imaging. Bronchogenic carcinoma, mycetoma, and cavitated Ghon tubercle would not typically present with purulent sputum or an air-fluid level on chest radiography.

Question 20

Primary tuberculosis is a disease classically affecting which of the following age groups?

Accepted Answer

Primary tuberculosis, which is the initial or first infection, typically affects children.

Quiz 24: Pulmonary Infections