Optic nerve tumor

Optic nerve tumor

An optic nerve melanocytoma is a tumor made up of melanocytes and melanin. These tumors are typically a benign; they can grow, but rarely transform into a malignancy. Even so, local growth can affect adjacent tissues.

Symptoms

Optic nerve melanocytoma does not usually produce symptoms or grow. If they slowly grow, optic nerve melanocytoma can produce afferent pupillary defects (30%), subretinal fluid (10%), and an enlarged blind spot (75%).

For example, if the tumor is next to the optic nerve, growth can compress the nerve and cause loss of vision (e.g. nerve fiber layer defects). Growth can also cause compressive vascular problems like central retinal vein occlusion. Lastly, growth also causes the tumor to exceed its blood supply. In these cases, necrotic areas form inside the tumor. Necrosis can (in turn) cause intraocular and rarely orbital inflammation.

Diagnosis

Most optic nerve melanocytomas are small, black, and do not grow.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Optic nerve glioma — Classification and external resources Magnetic resonance image of a large retrobulbar optic nerve tumor causing massive proptosis. ICD 10 C …   Wikipedia

  • Optic nerve sheath meningioma — Radiation treatment of ONSM MRI of a patient with ONSM …   Wikipedia

  • Abducens nerve — Nerve: Abducens nerve The path of the Abducens nerve …   Wikipedia

  • Recurrent laryngeal nerve — Nerve: Recurrent laryngeal nerve POSTERIOR VIEW: The tracheobronchial lymph glands (I. and E. Recurrent nerves visible at top.) …   Wikipedia

  • Brain tumor — Classification and external resources Brain metastasis in the right cerebral hemisphere from lung cancer shown on T1 weighted magnetic resonance imaging with intravenous contrast …   Wikipedia

  • Diktyoma — Medulloepithelioma Classification and external resources Histopathology of medulloepithelioma showing characteristic neural tube like strands. ICD O: M …   Wikipedia

  • Medulloepithelioma — Classification and external resources Histopathology of medulloepithelioma showing characteristic neural tube like strands. ICD O: M …   Wikipedia

  • Eye neoplasm — Classification and external resources ICD 10 C69 ICD 9 190 …   Wikipedia

  • Uveal melanoma — Classification and external resources Iris melanoma ICD 10 C69 …   Wikipedia

  • Ciliary body melanoma — is a type of cancer arising from the coloured part (uvea) of the eye. About 12% of uveal melanoma arise from the ciliary body. Contents 1 Clinical features 2 Treatment 3 See also …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”