Related Experiment Video
Updated: Apr 21, 2026

Surgical Treatment of an Endolymphatic Sac Tumor
Published on: May 26, 2023
Endolymphatic sac tumor as initial manifestation of von hippel-lindau syndrome
Pedro F Salazar1, Carol L Shields, Miguel A Materin
1From the Ocular Oncology Service, Wills Eye Institute, Thomas Jefferson University, Philadelphia, Pennsylvania.
Purpose:
To report endolymphatic sac tumor (ELST) as the initial finding in von Hippel-Lindau (VHL) syndrome.
Methods:
Case report.
Results:
A 4-year-old boy presented in February 2001 with right hearing loss and seventh nerve palsy from ELST. Genetic analysis showed a VHL mutation (gene 3p25-26). Systemic and ocular examination for VHL syndrome-related tumors was unrevealing. Four years later, multiple retinal hemangioblastoma (retinal capillary hemangioma) were detected in both eyes and successfully treated with argon laser photocoagulation.
Conclusion:
ELSTs can be the initial manifestation of VHL syndrome. Lifelong screening for related tumors, particularly retinal hemangioblastoma, is advised.
Related Concept Videos
Development of the Lymphatic System
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
Metastasis
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
Cerebral Edema ll: Pathophysiology

