Why does bitemporal hemianopia occur?
Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are Pituitary adenomas, and Craniopharyngiomas. Also another relatively common neoplastic etiology is Meningiomas.
What is meant by bitemporal hemianopia?
Bitemporal hemianopsia (or bitemporal hemianopia) describes the ocular defect that leads to impaired peripheral vision in the outer temporal halves of the visual field of each eye.
What is bilateral bitemporal hemianopia?
Bitemporal hemianopia (bi-: both eyes, temporal: temporal/peripheral, hemi-: half, anopsia: blindness) is defect in visual pathway causing loss of sight in the outer half of the visual field. A lesion compressing or disrupting optic chiasm would result in bitemporal hemianopia.
Why does pituitary tumors cause bitemporal hemianopia?
A pituitary tumor frequently causes bitemporal hemianopia by compressing the optic chiasm initially. Visual field defects are thought to be due to the direct compression or the effect on the blood supply of the optic chiasm.
Is Bitemporal hemianopia tunnel vision?
Bitemporal hemianopsia (“tunnel vision”) is a type partial blindness affecting the lateral halves of vision in both eyes (see attached diagram), and is usually associated with lesions or compression of the optic chiasm.
What does Bitemporal mean?
Medical Definition of bitemporal : relating to, involving, or joining the two temporal bones or the areas that they occupy.
What causes Bitemporal upper Quadrantanopia?
Homonymous superior quadrantanopia is caused by damage to the contralateral inferior parts of the posterior visual pathway: the inferior optic radiation (temporal Meyer loop), or the inferior part of the occipital visual cortex below the calcarine fissure.
What conditions can cause Bitemporal Hemianopsia?
A bitemporal hemianopia is almost always caused by damage to the optic chiasm and can occur from the direct or indirect effects of a variety of lesions, including tumors,1 aneurysms,2 and, less frequently, inflammatory and ischemic diseases.
What is the ICD 10 code for Bitemporal hemianopia?
The ICD code H534 is used to code Bitemporal hemianopsia It is usually associated with lesions of the optic chiasm, the area where the optic nerves from the right and left eyes cross near the pituitary gland.
What is Bitemporal epilepsy?
Bitemporal epilepsy is a difficult problem, especially when the epilepsy originates in the hippocampus. The diagnosis of bitemporal epilepsy is mostly reached after some form of invasive monitoring. There are now four standard surgical epilepsy treatments available to patients.
What is temporal and Bitemporal relation?
In this definition, “bi” refers to the capture of exactly two temporal aspects. An alternative definition states that a bitemporal relation captures one or more valid times and one or more transaction times. In this definition, “bi” refers to the existence of exactly two types of times.