How rare is an Endolymphatic sac tumor?
Endolymphatic sac tumor (ELST) is an exceedingly rare tumor of the epithelium of endolymphatic ducts and sacs (EDS) with less than 200 cases reported. Although histologically benign, ELST presents clinically invasion behavior because of the disease’s potential for locally infiltration and destruction of bone.
Are endolymphatic sac tumors malignant?
Endolymphatic sac tumor (ELST) is a rare neoplasm with benign histopathological appearance and clinically destructive behavior which occurs in the skull base and frequently invades the posterior petrous bone, the mastoid, semicircular canal, cerebellopontine angle structures and cranial nerve.
What does the Endolymphatic SAC do?
The main functions ascribed to the endolymphatic sac are the regulation of the volume and pressure of endolymph, the immune response of the inner ear, and the elimination of endolymphatic waste products by phagocytosis.
What is the Endolymphatic duct?
The endolymphatic duct is a small epithelial-lined channel, part of the membranous labyrinth that passes through the vestibular aqueduct in the bony labyrinth of the petrous temporal bone. It arises from the utricle and saccule via the utriculosaccule duct and drains endolymph.
Where is the Endolymphatic sac located?
inner ear
The endolymphatic sac (ES) is a membranous structure in the inner ear located partly in the temporal bone and partly within the dura of the posterior fossa. It contains endolymph, which is similar in chemical makeup to intracellular fluid (high in K, low in Na).
What is Endolymphatic sac decompression?
Endolymphatic sac decompression is a treatment that is performed to maintain the hydrostatic pressure and endolymph homeostasis in the inner ear for patients with Meniere’s disease. This procedure can reverse the damage to the ear while maintaining the balance of your hearing levels.
What is endolymphatic sac procedure?
Where is the endolymphatic sac?
The endolymphatic sac is a reservoir pouch that resides on the posterior surface of the petrous bone against the posterior fossa dura. It is connected via the vestibular duct to drain into the endolymphatic space of the cochlea.
Where is the endolymphatic sac located?
What is endolymphatic sac surgery?
What causes endolymph?
Endolymph is created from perilymph. The endocochlear potential is the sum of two potentials: a positive potential caused by active secretion of K+ by the stria vascularis (120mV) and a negative potential created by the passive diffusion of K+ ions from the hair cells (40mV), which can be visualised after an anoxia.
Is there a tumor in the left endolymphatic sac?
A CT scan revealed minimal bone erosion adjacent to the left endolymphatic sac. At surgery, a small endolymphatic-sac tumor associated with hemorrhage was apparent when the endolymphatic duct and sac were opened. The duct and sac were resected with the tumor.
How old is the average person with an endolymphatic sac tumor?
Typically endolymphatic sac tumors are encountered in young individuals, with a mean age at onset is 22 years 2.
Are there endolymphatic sac tumors in VHL 2?
Endolymphatic tumors are most often associated with von Hippel-Lindau disease (vHL) and are detected in 11-16% patients with vHL 2. However, in ~60% of patients with vHL and vestibulocochlear symptoms, there is no evidence on imaging of an endolymphatic sac tumor 2.
Are there endolymphatic sac tumors in von Hippel-Lindau disease?
However, in ~60% of patients with von Hippel-Lindau disease and vestibulocochlear symptoms, there is no evidence on imaging of an endolymphatic sac tumor 2. When these tumors are present in the setting of von Hippel-Lindau disease, then 30% of tumors are bilateral 2.