Pituitary Adenoma Causing Compression of the Optic Chiasm
Sep 9, 2013 · Specifically, in this patient the left optic nerve and the optic chiasm were most affected, as evidenced by the visual acuity loss OS and the temporal visual field loss OD with preservation of visual acuity. Thus, our chief concern was for a sellar mass.
Chapter 1. Glaucoma: Optic Nerve Disease - University of Iowa
The nerve fibers that entered the chiasm as part of the optic nerves, travel from the chiasm to the lateral geniculate body but are now called optic tracts. Finally, visual input is transmitted from the lateral geniculate body and travel as optic radiations …
2-month-old with bilateral optic nerve hypoplasia: - University of …
May 18, 2012 · The optic nerve forms around 6 weeks gestation in human embryos with extension of the optic nerve fibers to the chiasm by 8 weeks gestation (Billson, 1986). Embryologic development of the corpus callosum and septum pellucidum occurs roughly at the same time as the optic nerve; therefore, midline central nervous system abnormalities are ...
EyeRounds.org: Optic Nerve Hypoplasia - University of Iowa
Feb 21, 2005 · The appearance of the optic nerves supports optic nerve hypoplasia, most likely since birth. Both optic nerves are small (less than 1.484 mm2 OD) with normal mean disc area being 2.89 mm2. Additionally, the left optic nerve is severly hypoplastic with only a stump of nerve tissue with crowded retinal vessels exiting the nerve.
Optic neuritis: from one medical student to another medical student
Aug 30, 2013 · The optic nerve leaves the orbit via the optic canal through the sphenoid bone and continues to the optic chiasm. At this point the fibers conducting signals from the nasal fibers (temporal visual fields) decussate, whereas those carrying information from the temporal retina (nasal visual fields) continue to travel ipsilaterally.
Unilateral Optic Nerve Hypoplasia in a patient desiring surgical ...
Aug 30, 2011 · The optic nerve forms in human embryos at around 6 weeks gestation. Extension of the optic nerve fibers to the chiasm is complete by 8 weeks gestation.[2] Embryologic development of the corpus callosum and septum pellucidum occurs roughly at the same time as the optic nerve, hence the increased rate of coexisting anomalies.
Myelin Oligodendrocyte Glycoprotein (MOG)-IgG Associated …
Sep 17, 2020 · In addition, enhancement of the optic nerve sheath (i.e. perineural) is generally seen in 50% of MOG-IgG ON. In contrast, AQP4-IgG positive ON generally has a predilection for the posterior optic pathway. Similarly, long segments of the optic nerve may be involved, but it can also involve the optic tract and/or optic chiasm.
Neurofibromatosis Type 1—Optic Nerve Glioma: - University of Iowa
May 15, 2005 · Optic nerve gliomas occur in 12% of patients with NF1 with most of these occuring within the first decade of life. Imaging reveals a fusiform, circumscribed enlargement of the optic nerve and nerve sheath. The tumor has no calcification, is iso- or hypointense on T1 and hyperintense on T2 MRI imaging.
Visual Field Testing: From One Medical Student to Another
The nerve fibers travel to the optic nerve head, where the optic nerve originates. At the optic nerve head (also known as the optic disc), there are no photoreceptors, only nerve fibers. This region corresponds to the physiologic scotoma. The highest density of cone (photopic) photoreceptors is located in the macula.
Unilateral Optic Nerve Granuloma: - University of Iowa
Mar 14, 2017 · For this reason, MRI imaging of the brain and orbits was performed in this patient. The facial and optic nerves are the most commonly affected cranial nerves in neurosarcoidosis, and it has been documented that this disease process can affect the optic nerve head, optic tract, and/or optic chiasm, although each is very rare [1 ,6].