![]() ![]() In the anteroposterior view of the chest, the hila project in a "C" shape on either side. 1 These remain the two most important tools in differentiating abnormalities of the hilum, even today, when artificial intelligence is aiming to taking over chest X-ray analysis. We then move on with an anatomical-radiological focus on the "hilum overlay sign" and the "hilum convergence sign" described by Felson in 1973. This literature review discusses two classic radiological signs which are extremely useful in a three-dimensional characterisation of a two-dimensional study. Moreover, its accessibility and low radiation dose give it an advantage over other imaging techniques. The chest X-ray is the preferred imaging study when thoracic disease is suspected. Even though X-rays were one of the earliest imaging methods to be developed, they still play a leading role and carry great importance in clinical practice. Computed tomography (CT) and magnetic resonance imaging (MRI) are commonly used for this part of the chest, but anteroposterior X-ray is usually the first and only method available to the physician making the initial assessment.ĭue to wide variation in the normal appearance of the hilum, it is often wrongly reported as abnormal when it is not, and vice versa. A common, everyday problem of conventional radiology is the analysis of the pulmonary hilum, a complex anatomical structure in which arteries, veins, bronchi, pleura, pericardium and nerves converge, making it difficult to characterise a lesion's dependence. ![]()
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