Maxillary Sinus is largest among the paranasal sinuses. Anatomically it is in close relation to the oral cavity via the maxillary molars. Any infection that occurs in the region of maxillary molars should be very well suspected. And thus, dentists and otolaryngologists should be aware of the pathologies occuring in this region. This book highlights the pathologies that occur in maxillary sinus with its imaging and treatment.