Table 1 Demographic characteristics of patients.
From: Thirty-year clinical experience in gamma knife radiosurgery for trigeminal schwannomas
No. of patients | 87 (88 tumors) |
Median follow-up period | 64.3 months (12.0–311.5 months) |
Median age | 53 years (13–79 years) |
Male:female | 37:50 |
Neurofibromatosis type 2 | 1 |
Operation history | 11 (13%) |
Hypertension | 17 (20%) |
Diabetes mellitus | 5 (6%) |
Medication use | 13 (15%) |
Radiosurgery details | |
Mean tumor volume | 4377 mm3 |
Dose | 13 Gy (50% isodose line) |
Fractionation | 3 |
Repeat GKRS | 4 |
Tumor type | |
Root | 37 (43%) |
Ganglion | 32 (36%) |
Dumbbell | 19 (22%) |
Tumor location | |
Cisternal | 32 (36%) |
Meckel’s cave | 41 (47%) |
Cavernous sinus | 5 (6%) |
Foraminal | 9 (10%) |
Extracranial | 1 (1%) |
Imaging findings | |
T1 signal intensity | |
Low | 41 |
Iso | 32 |
High | 0 |
T2 signal intensity | |
Low | 2 |
Iso | 44 |
High | 29 |
Extracranial extension | 10 (11%) |
Cystic portion | 13 (15%) |
Transient swelling | 19 (22%) |
Central necrosis | 37 (42%) |
Peritumoral edema | 1 (1%) |
Outcomes | |
Imaging | |
Shrunk | 40 (45%) |
Stable | 39 (44%) |
Progressed | 9 (10%) |
Symptom | |
Improved | 44 (50%) |
Stable | 38 (43%) |
Aggravated | 6 (7%) |
