Mixed (external) laryngocele.Laryngoceles occur when the laryngeal ventricle or its more distal saccule saccule /sac·cule/ (sak´ul) 1. a little bag or sac. 2. the smaller of the two divisions of the membranous labyrinth of the ear. alveolar saccules see under sac. (appendix) becomes functionally obstructed as a result of an increase in intraglottic pressure, such as that caused by excessive coughing, playing a wind instrument, glass blowing, etc. A less common cause is an obstruction of the proximal saccule by a postinflammatory stenosis, trauma, or tumor (e.g., squamous cell carcinoma squamous cell carcinoma n. A carcinoma that arises from squamous epithelium and is the most common form of skin cancer. Also called cancroid, epidermoid carcinoma. ). The laryngocele can be filled with air, fluid, or purulent pu·ru·lent adj. Containing, discharging, or causing the production of pus. Purulent Consisting of or containing pus Mentioned in: Lacrimal Duct Obstruction purulent containing or forming pus. material. As the laryngocele enlarges, it penetrates the thyrohyoid membrane and enters the submandibular submandibular /sub·man·dib·u·lar/ (sub?man-dib´u-ler) below the mandible. submandibular (sub´mandib´y space. (1) On computed tomography (CT), a mixed (external) laryngocele appears as a well-marginated, air- or fluid-filled cystic mass in the lower submandibular space at the level of the thyrohyoid membrane. The isthmus (or waist) through the perforation of the membrane is readily identified (figure). The internal component of the mixed laryngocele can be collapsed and not well visualized. In addition, CT might readily demonstrate an internal (or simple) laryngocele, a pyolaryngocele, or a secondary laryngocele; the latter can be formed when a small tumor obstructs the opening of the ventricle in the supraglottis. In a LETTER TO THE EDITOR in the March issue of EAR, NOSE, AND THROAT JOURNAL, a comment was made regarding the differentiation between laryngoceles and pharyngoceles. (2) The latter term refers to the air-filled neck masses that arise in the pharynx in the region of the pyriform pyriform pear-shaped. pyriform apparatus pair of triangular structures in the eggs of anoplocephalid tapeworms surrounding the oncosphere. sinuses. References (1.) Harnsberger HR. Cystic masses of the head and neck: Rare lesions with characteristic radiologic features. In: Harnsberger HR. Handbook of Head and Neck Imaging. 2nd ed. St. Louis: Mosby, 1995:199-223. (2.) Ward PH. Bilateral laryngoceles in a young trumpet player: Case report [letter]. Ear Nose Throat J 2001;80:132. From the Department of Radiology, Louisiana State University Louisiana State University and Agricultural and Mechanical College, generally known as Louisiana State University or LSU, is a public, coeducational university located in Baton Rouge, Louisiana and the main campus of the Louisiana State University System. Health Sciences Center, New Orleans (Dr. Palacios), and the Department of Radiology and Otolaryngology, University of Illinois University of Illinois may refer to:
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