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Perineural optic nerve changes in endocrine orbitopathy.

H W Skalka

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |March 1, 1978
    PubMed
    Summary
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    Endocrine orbitopathy causes enlargement of the retrobulbar optic nerve and increased intervaginal distension, even without functional optic nerve compromise. The exact cause of this nerve sheath enlargement is still unknown.

    Area of Science:

    • Ophthalmology
    • Endocrinology
    • Medical Imaging

    Background:

    • Endocrine orbitopathy is an autoimmune condition affecting the eye socket.
    • Optic nerve involvement can lead to vision loss in endocrine orbitopathy.
    • Ultrasonography is a valuable tool for assessing orbital structures.

    Purpose of the Study:

    • To investigate ultrasonographic changes in the retrobulbar optic nerve and extraocular muscles in patients with endocrine orbitopathy.
    • To correlate these ultrasonographic findings with the clinical status of thyroid function and extraocular muscle involvement.

    Main Methods:

    • A-scan ultrasonography was used to measure the diameters of the retrobulbar optic nerve and its dural sheath.
    • Extraocular muscle thickness was also measured using ultrasonography.

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  • Measurements were taken in 55 eyes from 30 patients with varying degrees of endocrine orbitopathy.
  • Main Results:

    • Enlargement of the retrobulbar optic nerve diameter was observed in all evaluated eyes.
    • A positive correlation was found between extraocular muscle involvement and the degree of intervaginal distension.
    • These ultrasonographic findings were consistent across hyperthyroid, hypothyroid, and euthyroid patients.

    Conclusions:

    • Ultrasonography reveals characteristic changes in the retrobulbar optic nerve and extraocular muscles in endocrine orbitopathy.
    • These changes, including nerve sheath enlargement, occur independently of thyroid status and functional optic nerve compromise.
    • The underlying cause of the observed subdural perineural enlargement requires further investigation.