Question

multiple choice question
if a silhouette sign is noted at the right heart boarder, which lobe is involved?
please select your answer...
a right upper lobe
b right middle lobe
c right lower lobe

Explanation:

The silhouette sign occurs when the border - forming structure (such as the heart border) loses its sharp outline due to adjacent lung consolidation. The right middle lobe is adjacent to the right heart border. When the right middle lobe is consolidated (e.g., in pneumonia), the right heart border becomes indistinct (the silhouette sign). The right upper lobe is more superior and not adjacent to the right heart border in the same way. The right lower lobe is inferior and its consolidation would affect the diaphragm border rather than the right heart border.

Answer:

B. Right middle lobe