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 Pulmonary mycetomas on radiographs most commonly show as and explain in detail?
The fungal ball produces a tumor-like opacity on X ray,but can be distinguished from a carcinoma by the presence of a crescent of air between the fungal ball and the upper wall of the cavity(Air crescent sign).HRCT is more sensitive. Reference:Davidson's Medicine-22nd edition,page no:698.