Glomus tumor was also the name formerly (and incorrectly) used for a tumor now called a paraganglioma. A glomus tumor is a rare neoplasm arising from the. Paragangliomas account for % of all neoplasms in the head and neck region, and about 80% of all paraganglioms are either carotid body tumors or glomus. glomus vagal que tienen una llamativa predilección para las mujeres.9 Base de cráneo y cuello (timpánico, foramen yugular, nervio vago y tumor carotídeo.
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In rare cases, the tumors may present in other body areas, such as the gastric antrum or glans penis.
GLOMUS TIMPANICO by Silvia Acuña on Prezi
Malignant glomus tumors, or glomangiosarcomasare extremely rare and usually represent a locally infiltrative malignancy. Treatment is essentially the same. Discussion Glomus tumours at the level temporal bone may arise from non-chromaffin para ganglia or glomus bodies, located in the adventitia of the dome of the jugular bulb, along the course of the tympanic branch of the glossopharyngeal nerve jugular fossa to promontory in the middle earor along the course of the auricular branch of the vagus nerve jugular fossa to descending portion of the facial nerve.
Coronal reconstruction of middle ear cavity. Complications are however not uncommon due to the large number of sensitive structures in the region and include:. The probable misdiagnosis of many of these glojus as hemangiomas glomjs venous malformations also makes an accurate assessment of incidence difficult.
Tumours are locally infiltrating, and may rarely metastasize 4. Full screen case with hidden diagnosis. A CT scan can demonstrate a soft tissue mass in the middle ear and its position timpannico to patterns of bone destruction. A coronal reconstruction showing the glomus tympanicum within the middle ear. Angiography also has a role to play in preoperative embolisation, which is typically carried out days prior to surgery, however care must be taken to fully evaluate feeding vessels.
Glomus jugulare tumours are defined according to location i. To quiz yourself on this article, log in to see multiple choice questions. These tumors tend to have a bluish discoloration, although a whitish appearance may also be noted. This information is essential for the surgeon since a glomus tympanicum can be removed via the transtympanic route, while a glomus jugulare needs an extensive skull based surgery 1.
If the margins cannot be clearly identified, during otoscopy, the tumour must be assumed to be a glomus jugulare until proven otherwise. Synonyms or Alternate Spellings: Figure 1 An axial CT scan of the middle ear. There is erosion of the long process of incus, inferior semicircular canal and the basal turn of cochlea and the lateral wall of tympanic segment of facial nerve.
Glomus tympanicum paraganglioma | Radiology Reference Article |
Solitary glomus tumors, particularly subungual lesions, are more common in females than in males. Differential diagnosis of jugular foramen lesions. Multiple lesions are slightly more common in males.
Otolaryngol Clin North Am. While it is a rare tumor, it is the most common of the jugular fossa tumours.
The relative prevalence of glomus jugulare with respect to other head and neck paraganglioma varies from publication to publication and depending on definition of the terms jugulare, tympanicum and jugulotympanicum. Figure 2 A coronal reconstruction of the middle ear cavity. Histologically, glomus tumors are made up of an afferent arteriole, anastomotic vessel, and glomjs venule.
Armed Forces Institute of Pathology. When significant involvement is present then the lesion may cause pulsatile tinnitus and hearing loss.
Angiography demonstrates an intense tumor blush, with the most common feeding vessel being the ascending pharyngeal 3. Glomus tumors do not arise from glomus cellsbut paragangliomas do. Paragangliomas in the skull base are ubiquitous in their distribution and arise from paraganglia or glomus cells situated at the following timpanivo. Endolymphatic sac tumor Endolymphatic sac tumor. Radiographics full text [ pubmed citation ] 4.
Most agree however that they are more common than glomus vagale 3. Case with hidden diagnosis. You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Early draining veins are also noted due to intra-tumoural shunting 4. Their clinical presentation results from expansion gkomus the areas around the site of origin. Views Read Edit View history. Support Radiopaedia and see fewer ads. Play Add to Share View revision history.