If the infection is in the posterior ethmoids and sphenoid, symptoms are described as deep in the head or referred to the occiput. Acute sinusitis is also typically accompanied by systemic signs ...

Ethmoid and maxillary sinusitis tend to occur more frequently than sphenoid and frontal sinusitis. Sphenoid and frontal sinuses do not develop until late childhood, and as a result, these sinuses ...

Fungal balls in the paranasal sinuses, particularly in the maxillary and sphenoid sinuses, represent a common form of non-invasive fungal sinusitis ... leading to various symptoms, including ...

Nasal polyps can be a persistent issue for individuals suffering from chronic sinusitis ... frontal, and sphenoid sinuses, although not all patients will have polyps in every sinus.