You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is not a feature of primary tuberculosis: September 2010 and explain in detail?
Ans. A: Apical lung cavityThe primary complex generally exists singly and only occasionally in multiple units.In overwhelming majority of cases primary complex occurs in the lungs and only in about 5% cases they are distributed among the intestines, Oropharynx, the skin and other rarer sites. The primary focus in the lungs is called as Ghon focus. It generally occurs in the subpleural region of midline and lower lung zones. Mostly hilar and inter-pleural lymph nodes are involved to form the primary complex.Secondary TB is usually localized to apical and posterior segment of upper lobes.