Hydrops due to syphilitic endolymphatic duct obliteration

Area of Science:

• Otolaryngology
• Pathology
• Infectious Diseases

Background:

• Otologic syphilis is a rare manifestation of tertiary syphilis.
• Endolymphatic duct obstruction can lead to hearing loss and vertigo.
• Previous studies have not fully elucidated the histopathological basis of treatment resistance.

Purpose of the Study:

• To investigate the histopathological changes in the endolymphatic duct in cases of otologic syphilis.
• To determine the relationship between these changes and the failure of medical and surgical treatments.

Main Methods:

• Histopathological examination of three pairs of temporal bones from patients with confirmed otologic syphilis.
• Microscopic analysis focused on the endolymphatic duct and surrounding structures.
• Assessment of inflammatory cell infiltration, fibrosis, and ductal patency.

Main Results:

• All studied temporal bones exhibited significant infiltration and obliteration of the endolymphatic duct.
• The obliteration was characterized by the presence of round cells, giant cells, and dense fibrous tissue.
• Evidence of associated endolymphatic hydrops was observed.

Conclusions:

• Histopathological findings indicate that endolymphatic duct obliteration is a key feature of advanced otologic syphilis.
• This structural damage may render medical treatments and endolymphatic sac surgery ineffective.
• Further research into managing syphilitic labyrinthitis with obstructed endolymphatic ducts is warranted.