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Ear Pathology Online

Pathology of Lipoma of Internal Auditory Canal

Dr Sampurna Roy MD 

 

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Lipomas of the internal auditory canal are extremely rare. The origin of lipomas in this location is uncertain,but they are believed to be a malformation rather than a neoplasm.

Visit: Lipoma and variants

The lesion occurs in only 0.08% of general autopsies.

The tumour occurs in the third to fifth decade of life. There is a male predominance of 25:1.

Lipomas of the internal auditory canal may involve cranial nerves VII and VIII, whereas cerebellopontine angle lipomas may involve cranial nerves V through XII.

Symptoms show unilateral hearing loss, tinnitus, and vertigo and are clinically and audiologically indistinguishable from those of eighth cranial nerve schwannomas.  

Visit: Vestibular Schwannoma of the Ear

Grossly, these lesions are composed of soft, lobulated, yellow, fatty-appearing tissue that is difficult to dissect from the adjacent nerves because the growth pattern is infiltrative rather than expansile.

Histologically, lipomas are composed of nerve fascicles, ganglion cells, and mature adipose tissue, which infiltrate and separate the nerve fibers. Cartilaginous elements have been described on rare occasion.

Differential diagnosis: The primary histologic differential diagnosis is lipoblastic meningioma. Meningiomas, however, are typically much larger than lipomas, and only rarely are confined to the internal auditory canal.

When adipose tissue is present along with thick-walled blood vessels, smooth muscle, and skeletal muscle, the finding is termed lipochoristoma.

Visit:  Meningioma of the Middle Ear ; Lipochoristoma of middle/inner ear or temporal bone .

 

Further reading

Lipomas of the internal auditory canal--report of two cases and review of the literature.

Internal auditory canal mass in a 46-year-old woman. 

Lipomas of the internal auditory canal and cerebellopontine angle.

Lipoma of the internal auditory canal. Report of two cases simulating acoustic neuroma.

Lipomas of the internal auditory canal.

Lipomas of the internal auditory canal.

Lipoma of internal auditory canal.

Lipomas of the internal auditory canal.

Lipoma of the internal auditory canal. An anatomo-clinical case study and review of the literature about cranial nerve lipomas

Lipomas of the internal auditory canal.

Ear Pathology Online - Home Page           Ear Pathology Online -Index 

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

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