Table 3.
Common genomic alterations in orbital meningiomas. Abbreviations: Ob = intraorbital ectopic meningiomas; ON = optic nerve sheath meningiomas; Sph‐Ob = spheno‐orbital meningiomas
| Genomic alteration | No. of cases | Percentage (%) | ||||
|---|---|---|---|---|---|---|
| Sph‐Ob | ON | Ob | Sph‐Ob | ON | Ob | |
| del(22q) or −22 | 7/10 | 1/5 | 3/4 | 70 | 20 | 75 |
| del(1p) | 5/10 | 1/5a | 0/4 | 50 | 20a | 0 |
| del(6q) | 5/10 | 0/5 | 0/4 | 50 | 0 | 0 |
| del(19p) | 5/10 | 2/5 | 0/4 | 50 | 40 | 0 |
a
The deleted region on chromosome 1p in this particular case is different from those detected in Sph‐Ob meningiomas (see Table 2).