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 'Apical cap' on CXR is seen in: and explain in detail?
Ans. A. Dissecting aneurysmDissecting aneurysmCXRa. Normal CXR in 25% casesb. Calcification sign (inward displacement of calcification plaque by >4-10mm from outer aortic contour) or the calcification in the aortic knuckle, which is separated from the outer margin by more than 1cm, is said to be suggestive of dissection.c. Disparity in size between ascending and descending datad. Irregular wavy contour/indistinct outline of aortae. Localized dilation of aortic knuckle and upper descending aorta, which may give rise to prominent lump' signf. Lateral projection of aortic knuckleg. Widening of superior mediastinumh. Left sided pleural effusioni. 'Apical cap' signj. Rightward displacement of trachea