Paranasal Sinuses


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Paranasal Sinuses

 

air cavities in the cranial bones that communicate with the nasal cavity by means of narrow canals or fissures.

The maxillary sinus, or antrum of Highmore, is located in the maxillary bone; the opening connecting it to the nasal cavity is situated in the meatus nasi medius. The frontal sinus is located between the membranes of the orbital part and the squama frontalis; it communicates with the nasal cavity by way of the nasofrontal duct, which opens into the anterior part of the meatus nasi medius. The ethmoidal labyrinth consists of two to five or more air cells of varying size and shape. The anterior cells open into the meatus nasi medius, and the posterior cells into the meatus nasi superior. The sphenoidal, or wedge-shaped, sinus is located in the body of the sphenoid bone immediately behind the ethmoidal labyrinth; the anterior wall of each half of the sinus has openings that connect it to the nasal cavity.

The mucous membrane lining of the paranasal sinuses is similar in structure to that of the nasal cavity but is considerably thinner and relatively lacking in vessels and glands. The most common disturbances of the paranasal sinuses are caused by inflammations of their mucosa, or sinusitis, and by traumas.

References in periodicals archive ?
Paranasal sinuses on MR images of the brain: significance of mucosal thickening.
Osteomas of the paranasal sinuses. J Laryngol Otol 1981;95(3):291-304.
Pictorial essay: Anatomical variations of paranasal sinuses on multidetector computed tomography - How does it help FESS surgeons?
Metastasis may reach the paranasal sinuses by hematogenous, lymphogenous, or vertebral venous plexus pathways.
Mohindroo, "An unusual foreign body in the paranasal sinuses," Indian Journal of Otolaryngology and Head & Neck Surgery, vol.
Cysts, benign tumors, and malignant tumors of the paranasal sinuses. Otolaryngol Clin N Am.
To ensure a representative result, 340 datasets on the nose and paranasal sinuses were randomly extracted retrospectively from the CBCT database by taking every third examination for further analysis.
Squamous carcinoma of the nasal cavity and paranasal sinuses. Am J Surg 1989;158(4):328-332.
The plane for CT scanning of paranasal sinuses was kept parallel to inferior orbitomeatal line (Reid's baseline) starting at the level of maxillary alveolus just below the hard palate and to end above the level of frontal sinus.
The US-based National Cancer Institute advises that "the majority of tumours of the paranasal sinuses present with advanced disease, and cure rates are generally poor (<50%).