Question

multiple choice question required which of the following radiographic features most suggests an extraparenchymal mass? please select your answer... a ill - defined, feathered margins b presence of air bronchograms within the opacity c obtuse angles with the pleural surface d acute angles with the chest wall

Explanation:

• Option A: Ill - defined, feathered margins are more characteristic of parenchymal lesions (e.g., some types of lung cancers or inflammatory parenchymal processes) rather than extraparenchymal masses.
• Option B: Air bronchograms within an opacity are typically seen in parenchymal consolidation (e.g., pneumonia) where the air - filled bronchi stand out against the consolidated lung parenchyma.
• Option C: Extraparenchymal masses (such as pleural - based masses like pleural tumors or extra - lung masses adjacent to the pleura) tend to form obtuse angles with the pleural surface. This is because they grow outward from the pleural or extra - parenchymal space.
• Option D: Acute angles with the chest wall are more in line with parenchymal lesions that abut the chest wall.

Answer:

C. Obtuse angles with the pleural surface