Pathognomic features of Maxillary sinusitis is:
**Core Concept**
The maxillary sinus is the largest of the paranasal sinuses and has a complex anatomy, making it prone to infections. Pathognomonic features refer to specific signs or symptoms that are uniquely characteristic of a particular disease or condition.
**Why the Correct Answer is Right**
The pathognomonic feature of maxillary sinusitis is a palpable step or bulge in the infraorbital region, known as the "Step sign" or "Palpable bulge." This occurs due to the swelling of the maxillary sinus mucosa and the adjacent soft tissues. The maxillary sinus is located in the orbital floor, and its inflammation can cause the orbital floor to become displaced, leading to the palpable step.
**Why Each Wrong Option is Incorrect**
* **Option A:** The Halberg sign is a clinical sign of ethmoidal sinusitis, not maxillary sinusitis. It is characterized by tenderness over the medial canthus.
* **Option B:** The "Painful eye" sign is associated with frontal sinusitis, not maxillary sinusitis. It occurs due to the shared innervation of the frontal sinus and the eye.
* **Option C:** The "Sunset sign" is a radiographic feature of maxillary sinusitis, but it is not pathognomonic. It refers to the presence of air-fluid levels in the maxillary sinus on a lateral radiograph.
**Clinical Pearl / High-Yield Fact**
The "Step sign" is a classic clinical sign of maxillary sinusitis, but it can be subtle and may require gentle palpation to detect. It is essential to examine the patient in a quiet room with good lighting to appreciate this sign accurately.
**Correct Answer:** .