In the SMV projection, which two sinus groups are demonstrated?

In the SMV projection, which two sinus groups are demonstrated?

• A. Frontal and Maxillary
• B. Sphenoid and Ethmoid
• C. Ethmoid and Maxillary
• D. Sphenoid and Frontal

Answer: (B)

In the SMV projection, the rays come from below the chin, placing the central skull structures in a way that highlights the midline air-filled spaces. The sphenoid sinuses lie behind the nasal cavity in the sphenoid bone, and the ethmoid air cells are interposed between the orbits and the nasal cavity. This central, inferior angle-view aligns with these structures, so their air spaces project clearly with relatively little superimposition. Frontal sinuses sit higher and anterior, often obscured by the frontal bone in this view, while maxillary sinuses are lower and lateral, frequently overlapped by the zygomatic arches and alveolar regions. Because of that, they aren’t as well visualized in SMV. So the two sinus groups best demonstrated in the SMV projection are the sphenoid and ethmoid sinuses.

In the SMV projection, the rays come from below the chin, placing the central skull structures in a way that highlights the midline air-filled spaces. The sphenoid sinuses lie behind the nasal cavity in the sphenoid bone, and the ethmoid air cells are interposed between the orbits and the nasal cavity. This central, inferior angle-view aligns with these structures, so their air spaces project clearly with relatively little superimposition.

Frontal sinuses sit higher and anterior, often obscured by the frontal bone in this view, while maxillary sinuses are lower and lateral, frequently overlapped by the zygomatic arches and alveolar regions. Because of that, they aren’t as well visualized in SMV.

So the two sinus groups best demonstrated in the SMV projection are the sphenoid and ethmoid sinuses.