Which of the following is incorrect about miliary TB?
A. It is caused by erosion of the infection into a pulmonary vein, and then the bacteria reach the left side of the heart and enter the systemic circulation and seed many other organs such as the liver and spleen
B. The bacteria may also enter the lymph node, drain into a systemic vein and eventually reach the right side of the heart, from the right side of the heart, the bacteria may then seed the lungs, causing the "miliary" appearance, or futher re-seed other organs.
C. Sputum for AFB smear is typically positive
D. Sometimes it can be missed on CXR and picked up by HRCT thorax.
Answer: C
Reference
M/59 What is the Cause of the Respiratory Failure?