Which sinus is involved in a patient with a toothache and sinusitis
**Core Concept**
The maxillary sinus is closely related to the upper first and second molar teeth, making it susceptible to involvement in dental infections. This anatomical proximity allows for the spread of infection from the teeth to the maxillary sinus.
**Why the Correct Answer is Right**
The maxillary sinus, being the largest of the paranasal sinuses, has a thin bony wall that separates it from the maxillary antrum. This thin bony wall can be compromised by dental infections, leading to the spread of infection into the sinus. The close proximity of the upper first and second molar teeth to the maxillary sinus makes this sinus particularly susceptible to involvement in dental infections. The infection can enter the sinus through the thin bony wall or through the ostiomeatal complex.
**Why Each Wrong Option is Incorrect**
**Option A:** The frontal sinus is not typically involved in toothache-related sinusitis, as it is located more superiorly in the frontal bone and is not as closely related to the teeth.
**Option B:** The ethmoid sinus, although it is located near the nasal cavity, is not as closely associated with dental infections as the maxillary sinus.
**Option C:** The sphenoid sinus is located more posteriorly in the sphenoid bone and is not directly related to the upper teeth.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with a toothache and sinusitis, it's crucial to consider the involvement of the maxillary sinus, as this can indicate a dental infection that has spread to the sinus.
**Correct Answer:** A. Maxillary sinus.