CLINICAL MEDICINE

Detailed explanation-1: -Radiographically, the sinus appears as a radiolucent area of space demarcated by thin radiopaque lines. This cephalometric radiograph demonstrates the superior, inferior, anterior, and posterior walls which make up the borders of the maxillary sinus.

Detailed explanation-2: -Radiolucent – Refers to structures that are less dense and permit the x-ray beam to pass through them. Radiolucent structures appear dark or black in the radiographic image. Radiopaque – Refers to structures that are dense and resist the passage of x-rays.

Detailed explanation-3: -Radiopaque volumes of material have white appearance on radiographs, compared with the relatively darker appearance of radiolucent volumes. For example, on typical radiographs, bones look white or light gray (radiopaque), whereas muscle and skin look black or dark gray, being mostly invisible (radiolucent).

Detailed explanation-4: -In the normal patient presenting to the oral and maxillofacial practitioner, the normal radiopaque structures are anatomical: the teeth, the bones of the jaws (including the middle-third of the face and nasal bones), the stylohyoid complex (including the hyoid bone), the skull base, and cervical vertebrae.