Question:
A 25 year old male has a Mantoux test reading of 14 x 17 mm, along with weight loss, intermittent low grade fever, and hemoptysis for the past 4 months. Sputum smear is negative for acid fast bacilli (AFB) and the ESR is raised. What is the likely diagnosis?
A 25 year old male has a Mantoux test reading of 14 x 17 mm, along with weight loss, intermittent low grade fever, and hemoptysis for the past 4 months. Sputum smear is negative for acid fast bacilli (AFB) and the ESR is raised. What is the likely diagnosis?
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A strongly positive Mantoux with chronic fever, weight loss, and hemoptysis over months points to tuberculosis, even if the AFB smear is negative.
Updated On: Jul 8, 2026
- Pulmonary tuberculosis (PTB)
- Viral pneumonia
- Fungal pneumonia
- Bronchogenic carcinoma
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The Correct Option is A
Solution and Explanation
Step 1: List the clues in the case.
A young man has a strongly positive Mantoux test (14 x 17 mm is well above the 10 mm cut off used for a positive result in a high burden country), weight loss, low grade fever that comes and goes, and hemoptysis that has lasted 4 months. The ESR is raised, which points to an ongoing inflammatory or infective process.
Step 2: Explain why a negative AFB smear does not rule out tuberculosis.
Sputum smear microscopy only picks up TB when there are at least 5,000 to 10,000 bacilli per ml of sputum. Many active cases, especially early or paucibacillary disease, stay smear negative on one or two samples even though the patient truly has tuberculosis. So a negative smear here does not exclude PTB, it just means repeat samples, culture, or a test like CBNAAT/PCR are needed to confirm it.
Step 3: Match the clinical picture to pulmonary tuberculosis.
The combination of chronic low grade fever, weight loss, hemoptysis over months, a strongly positive Mantoux, and raised ESR is the classic textbook picture of pulmonary tuberculosis. This pattern is far more typical of PTB than of a viral or fungal chest infection.
Step 4: Rule out the other options.
Viral pneumonia usually runs an acute course of days, not 4 months, and does not produce this pattern of hemoptysis with weight loss. Fungal pneumonia (such as aspergillosis) is uncommon in a healthy 25 year old without an immunocompromised state or structural lung disease. Bronchogenic carcinoma is very unlikely at age 25, it usually appears after age 40, most often in long term smokers.
Final Answer:
The clinical picture fits pulmonary tuberculosis best, even with a negative AFB smear.
\[ \boxed{\text{Pulmonary tuberculosis (PTB)}} \]
A young man has a strongly positive Mantoux test (14 x 17 mm is well above the 10 mm cut off used for a positive result in a high burden country), weight loss, low grade fever that comes and goes, and hemoptysis that has lasted 4 months. The ESR is raised, which points to an ongoing inflammatory or infective process.
Step 2: Explain why a negative AFB smear does not rule out tuberculosis.
Sputum smear microscopy only picks up TB when there are at least 5,000 to 10,000 bacilli per ml of sputum. Many active cases, especially early or paucibacillary disease, stay smear negative on one or two samples even though the patient truly has tuberculosis. So a negative smear here does not exclude PTB, it just means repeat samples, culture, or a test like CBNAAT/PCR are needed to confirm it.
Step 3: Match the clinical picture to pulmonary tuberculosis.
The combination of chronic low grade fever, weight loss, hemoptysis over months, a strongly positive Mantoux, and raised ESR is the classic textbook picture of pulmonary tuberculosis. This pattern is far more typical of PTB than of a viral or fungal chest infection.
Step 4: Rule out the other options.
Viral pneumonia usually runs an acute course of days, not 4 months, and does not produce this pattern of hemoptysis with weight loss. Fungal pneumonia (such as aspergillosis) is uncommon in a healthy 25 year old without an immunocompromised state or structural lung disease. Bronchogenic carcinoma is very unlikely at age 25, it usually appears after age 40, most often in long term smokers.
Final Answer:
The clinical picture fits pulmonary tuberculosis best, even with a negative AFB smear.
\[ \boxed{\text{Pulmonary tuberculosis (PTB)}} \]
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