Tuberculosis: The Daily PANCE Blueprint
A 58-year-old man with a history of immigration from a high-prevalence country presents with fever, night sweats, weight loss, and a productive cough. Chest X-ray shows upper lobe infiltrates with apical cavitary lesions. Which diagnosis is most strongly suggested?
A. Small cell lung cancer (SCLC)
B. Primary tuberculosis
C. Reactivation tuberculosis
D. Atypical pneumonia caused by Legionella
E. Lung abscess due to anaerobic infection
Answer and topic summary
The answer is Reactivation tuberculosis.
Reactivation (secondary) tuberculosis occurs when latent Mycobacterium tuberculosis becomes active years after initial infection. It classically presents with constitutional symptoms (fever, night sweats, weight loss), productive cough, and upper lobe/apical cavitary lesions due to the higher oxygen tension in these regions, which favors mycobacterial growth.
Why this is NOT primary tuberculosis (key distinction):
Primary TB typically occurs soon after initial exposure, most often in children or immunologically naïve individuals. Imaging usually shows lower or middle lobe infiltrates, hilar or mediastinal lymphadenopathy, and non-cavitary disease. Cavitation and apical involvement are uncommon in primary infection. This patient’s age, chronic systemic symptoms, and apical cavitary disease strongly point toward reactivation TB rather than primary TB.
Why the other choices are incorrect:
- Small cell lung cancer can cause weight loss and cough but does not produce cavitary apical lesions with infectious symptoms.
- Legionella pneumonia causes atypical pneumonia with GI symptoms and hyponatremia, not cavitary upper lobe disease.
- Lung abscess due to anaerobes may cavitate but is typically associated with aspiration risk, foul-smelling sputum, and lower lobe involvement.
Board pearl:
Primary TB = lymph nodes + lower lobes + kids.
Reactivation TB = apical cavitation + night sweats + adults.
View blueprint lesson
Smarty PANCE Content Blueprint Review:
Covered under ⇒ PANCE Blueprint Pulmonary ⇒ ⇒
Also covered as part of the Internal Medicine EOR, Emergency Medicine EOR, and Family Medicine PAEA EOR topic list
