Stereotactic radiation therapy for optic nerve sheath meningioma; an experience at Ramathibodi Hospital.

OBJECTIVE: To evaluate results of stereotactic radiotherapy for the treatment of optic nerve sheath meningioma (OM) at Ramathibodi Hospital. MATERIAL AND METHOD: Twelve patients with primary OM were treated with stereotactic radiation between 1998 and 2005. Five patients underwent surgery and had no light perception before radiation. All patients except one were treated with fractionated stereotactic radiotherapy (FSRT). Mean average dose of FSRT was 55. 7 Gy; 180 cGy/fraction. One patient was treated with 15-Gy stereotactic radiosurgery. RESULTS: With a median follow-up of 34 months, there was no visual improvement in the five patients who were completely blind before radiation. Visual acuity improved in four patients and remained stable in two patients. Four of six patients had improved visual field, and five of six decreased in proptosis. Follow-up images were available in six patients, showing minimal tumor regression in five and stable in one. No serious acute side effect was observed. Vision became worse in one patient, who developed vitreous hemorrhage two years after FSRT. CONCLUSION: Stereotactic radiotherapy is an effective treatment for primary OM. It provides tumor control and visual preservation with low risk of complications. However more patients and further follow-up are needed for long-term outcomes.

Acute effects of postmastectomy radiotherapy after immediate TRAM flap reconstruction in breast cancer patients.

OBJECTIVES: To study the acute effects of radiotherapy after mastectomy and immediate transverse rectus abdominis myocutaneous (TRAM) flap reconstruction in breast cancer patients treated at Ramathibodi Hospital. MATERIAL AND METHOD: Between January 2004 and March 2005, ten breast cancer patients (age 32-51 years) were treated with postoperative radiotherapy after mastectomy and immediate TRAM flap reconstruction. Medical records of these patients were retrospectively reviewed. Radiotherapy was delivered to the chest wall and reconstructed TRAM flap using 6-MV x-ray or Cobalt-60. The total dose was 45 to 50.4 Gy delivered in 25 to 28 fractions. Patients were evaluated weekly during the course of radiation and then at 1 and 2 months after treatment completion to determine acute effects or toxicities of radiation. RESULTS: During radiation, 3 patients developed erythema or mild hyperpigmentation of the skin, and 4 developed moderate hyperpigmentation. Three patients who were treated with Cobalt-60 and/or bolus to the chest wall developed skin desquamation (1 dry desquamation, 2 moist desquamation). No patient required a treatment break because of acute side effects. One patient who received chemotherapy after radiation developed recalled moist desquamation. CONCLUSION: Radiotherapy after mastectomy and immediate TRAM flap reconstruction is well tolerated and is not associated with increased acute complication or radiation interruption. The authors have noticed that chemotherapy given after radiation was related to severe skin reaction, so it should be used with caution.

High-dose-rate interstitial brachytherapy in the management of carcinoma of the uterine cervix and other gynecologic malignancies.

OBJECTIVE: To report technique and experience of high-dose-rate (HDR) interstitial brachytherapy in the treatment of cervical carcinoma and other gynecologic malignancies. MATERIAL AND METHOD: Between April 2003 and October 2004, ten patients (7-cervical carcinoma, 3-vaginal stump carcinoma) were treated with interstitial implant. Indications for implant include previous hysterectomy and previous pelvic radiation. Patient characteristics, implant technique, and initial outcomes were reported. RESULTS: Transperineal interstitial implant was performed using fluoroscopy-guided technique. Brachytherapy dose/fraction ranged from 500-750 cGy for 1 to 6 fractions. Combined external beam radiation was given in 8 patients. After 5-21 months follow-up, all the patients were alive. Local control was achieved in 9 patients. One patient had persistent disease at the implant site. No acute complication from the procedure or serious late complication was observed. CONCLUSION: Interstitial implant can be a treatment option in patients with gynecologic malignancies who have limitations with standard intracavitary insertion. This technique is feasible, providing good local control without serious complications. However, long-term follow-up is needed.