Leksell gamma knife radiosurgery of the tumor glomus jugulare and tympanicum.
We have treated 14 patients with glomus tumor during the 4 years (of 1993 to 1997) using Leksell Gamma Knife radiosurgery. The male: female ratio was 1:3.7, and the mean age 48.6 years (range 22-75 years). The mean tumor volume was 5.5 cm3 (range 0.7-11.3 cm3). The mean maximum dose was 37.4 Gy (range 20-44 Gy). The mean margin dose was 19.4 Gy (range 10-25 Gy). In 3 patients, infrabasal spread of the tumor could not be delineated on peroperative stereotactic CT scans. As a result, this portion of the tumor was treated in 2 patients at a second stage using stereotactic MRI. Follow-up in 11 patients ranged from 6 to 42 months (mean 20.5 months). Hearing on the affected side was further impaired in 3 patients. Tinnitus, vertigo and ataxia improved in 3 patients, headache and nausea in 2 patients. Angiography after radiosurgery was performed in 3 patients. In one patient 12 months after the radiosurgery, pathological vascularisation had completely disappeared. In another patient pathological vascularisation was still present 22 months after the first stage, despite two-stage radiosurgery, although the tumor volume decreased 30%. In the last patient, vascularisation and tumor volume partially decreased 12 months after radiosurgery. The volume of the tumor decreased in 4 patients. No change in tumor volume has been observed in any of the other patients to date. Radiosurgery proves to be a safe treatment for glomus tumor with no acute morbidity. Because of its naturally slow growth rate, up to 10 years follow-up will probably be necessary to establish the therapeutic effectiveness of radiosurgery for glomus tumor.
Liscák
R
R
Department of Stereotactic and Radiation Neurosurgery, Hospital Na Homolce, Prague, Czech Republic.
Vladyka
V
V
Simonová
G
G
Vymazal
J
J
Janousková
L
L
D000328:Adult; D000368:Aged; D000792:Angiography; D005260:Female; D005925:Glomus Jugulare Tumor / Q000175:diagnosis / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010234:Paraganglia, Nonchromaffin / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D011184:Postoperative Period; D016634:Radiosurgery / Q000295:instrumentation*; D016896:Treatment Outcome