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Fossa navicularis magna is located on the anterior surface or pharyngeal surface of the clivus. Its position when present is between the spheno-occipital synchondrosis and the foramen magnum . Size of this fossa varies considerably and its depth ranges from 3.49 to 4.94 mm. [ 3 ] A histological study reported the presence of loose connective ...
Variations of the clivus include fossa navicularis magna, craniopharyngeal canal, canalis basilaris medianus, and transverse basilar fissure (Saucer's fissure). [5] Ossification of the apical ligament of dens may also occur, resulting in a variant bony tubercle at the inferior end of the clivus. [ 5 ]
Nasopharyngeal cyst refers to cystic swelling arising from midline and lateral wall of the nasopharynx. The commonest cyst arising from lateral wall is the nasopharyngeal branchial cyst, whereas the mucus retention cysts are the commonest to arise from the midline. [1] Sometimes nasopharyngeal cyst may directly refer to Tornwaldt cyst. [2]
An arachnoid cyst is a collection of cerebrospinal fluid (CSF) in the arachnoid mater. 10% of these occur in the posterior fossa. [9] In a posterior fossa arachnoid cyst, unlike in DWM: [6] [9] The cyst is clearly localised in a specific location separate from the fourth ventricle outlets.
The condition was dubbed "Jones Syndrome" later that year but this term is not widely used as another condition is also known by this name. In 2010, another family of Moroccan-Jewish origin were reported to have the syndrome, and it was noted that the posterior fossa anomalies were most likely responsible for the development of hydrocephalus. [2]
Tornwaldt's disease is a rare benign disorder caused by persistent notochord remnants. [3] This disease almost remains asymptomatic. [citation needed] At about the 10th week of embryonic development, the pharyngeal pouch forms by adhesion of the pharyngeal ectoderm to the cranial end of the notochord.
A thyroglossal cyst or thyroglossal duct cyst is a fibrous cyst that forms from a persistent thyroglossal duct. Thyroglossal cysts can be defined as an irregular neck mass or a lump which develops from cells and tissues left over after the formation of the thyroid gland during developmental stages.
It was described by George Caldwell in 1893 and Henry Luc in 1897. They describe the operation of maxillary sinus diseases via canine fossa. Functional endoscopic sinus surgery is the standard surgery for maxillary sinusitis nowadays. [10]