VOKA 3D Anatomy & Pathology on Instagram: "Maxillary sinusitis: from mucosal inflammation to purulent infection Maxillary sinusitis is an acute inflammatory condition affecting the mucosa of the maxillary sinus. In the catarrhal stage, inflammation leads to mucosal hyperemia and edema, disrupting normal sinus ventilation and mucociliary clearance, which are essential for sinus drainage and defense. As the disease progresses to the serous phase, increased vascular permeability causes serous exuda