Endolymphatic sac

From the posterior wall of the saccule a canal, the endolymphatic duct, is given off; this duct is joined by the utriculosaccular duct, and then passes along the vestibular aqueduct and ends in a blind pouch, the endolymphatic sac, on the posterior surface of the petrous portion of the temporal bone, where it is in contact with the dura mater. Studies suggest that the endolymphatic duct and endolymphatic sac perform both absorptive and secretory, as well as phagocytic and immunodefensive, functions. Fittingly, contrast agent uptake in the endolymphatic sac and duct in MRI is inversely correlated to endolymphatic hydrops, and endolymphatic sac and duct morphology changes have been observed in Meniere's Disease.

Neoplasms of the endolymphatic sac are very rare tumors.