Chiasm Syndrome
| Classification according to ICD-10 | |
|---|---|
| H47.7 | Affections of the optic chiasm |
| S04.0 | Injury to the optic nerve and the optic chiasm |
| ICD-10 online (WHO version 2019) | |
The chiasma syndrome (English chiasma syndrome , also bitemporal hemianopia ) occurs when the optic chiasm is damaged (the optic nerve cords cross over in the area of the pituitary gland ).
In the optic chiasm, the fibers of the nasal retina cross each other , which represent the temporal (outer) visual field. If only the crossing fibers are damaged and the rest remains intact, then the patient only has defects in the temporal field of vision (bitemporal hemianopia), but sees the rest of it perfectly. So he sees the center of his field of vision, but not the sides (like a tunnel vision ).
Such damage can result, for example, from injuries, pituitary tumors, chiasm tumors, meningiomas in this area and other brain tumors .
