Volumetric Modulated Arc Therapy (VMAT) make a difference in retro-orbital irradiation treatment of patients with bilateral Graves' ophthalmopathy. Comparative analysis of dosimetric parameters from different radiation techniques.

BACKGROUND: Graves' ophthalmopathy is the commonest extrathyroidal manifestation of Graves' disease. Treatment options include steroid therapy, corrective/decompressive surgery, radiation therapy or combination of these approaches. AIM: Our purpose was to investigate if retro-orbital irradiation with Volumetric Modulated Arc Therapy (VMAT) yielded better target coverage and dose sparing to adjacent normal structures compared to 3-Dimensional Conformal Radiotherapy (3DCRT) and Lateral Opposing Conformed Fields (LOCF). METHODS: Fourteen consecutive patients diagnosed with bilateral Graves' ophthalmopathy were prospectively recruited into this study from August 2012 until August 2014. An individual VMAT, 3DCRT and LOF plan was created for each patient. Conformity Index (CI), Homogeneity Index (HI) and other dosimetric parameters of the targets and organs-at-risk (OAR) were analyzed in all 28 orbits compared between the different techniques. RESULTS: CI generated by VMAT was superior to that produced by 3DCRT(p < .001) and LOF (p < .001). As expected, 3DCRT was also superior to LOF (p = .007). Regarding the OARs sparing dose (lens, globes, retina and lacrimal glands), VMAT showed a significant benefit when compared with 3DCRT and LOCF, with no differences between the two latter techniques. CONCLUSIONS: VMAT should be preferred over 3DCRT and LOF for bilateral Graves' ophthalmopathy treatment.

Review of the treatment of Graves' ophthalmopathy: The role of the new radiation techniques.

Graves ophthalmopathy (GO) is an autoimmune disorder and the most frequent extrathyroidal manifestation of Graves' disease. GO is an inflammatory process leading to an increased volume of the extraocular muscles and orbital connective and adipose tissues associated with multiple histopathological changes. Despite recent progress in the understanding of its pathogenesis, GO often remains a major diagnostic and therapeutic challenge. It has become increasingly important to classify patients into categories based on disease severity and activity. Low doses of radiotherapy (RT) have demonstrated a benefit in the treatment of moderate-to-severe GO with very few side effects. New RT techniques deliver a more conformal dose distribution to the target and decrease the dose to normal healthy tissue minimizing the risk of side effects. In this review we briefly analyzed the pathogenesis of GO and discussed the most relevant therapeutic approaches, with particular emphasis in the new RT technics. Appropriately designed and powered clinical studies are necessary to determine the most effective treatment with the lowest risk of side effects.

Treatment of facial cutaneous carcinoma with high-dose rate contact brachytherapy with customized molds.

BACKGROUND: The main treatment given for initial stage facial epitheliomas is surgery, although there are alternatives. We present our results with Ir-192 high-dose rate (HDR) contact brachytherapy. METHODS AND MATERIALS: Fifty-one epitheliomas, with a mean size of 1.5 cm and a maximum thickness of 3mm, were treated with HDR contact brachytherapy by means of customized molds, with plastic tubes on bolus for flat surfaces and on wax molds for the nose. A total dose of 48-57 Gy, 3-4 Gy/fraction three times a week, was administered. RESULTS: After a median followup of 45 months, five tumors relapsed (9.8%), four of them on the tip of the nose. The 5-year actuarial local control rate was 89%, 100% for flat surfaces, and 83% for the nose. All of them were salvaged with surgery. The treatment was well tolerated, 21.6% developed severe acute toxicity, with good or very good late cosmetic results. CONCLUSION: HDR contact brachytherapy is a good alternative to treat facial epitheliomas with a maximum thickness of 3mm. Tip of the nose tumors are not well covered with this technique and a different procedure is required.

Manejo del dengue hemorrágico durante el embarazo y presentación de dos casos / Treatment of hemorrhagic dengue during pregnancy

Se presentaron dos casos de dengue hemorrágico durante el embarazo, manejados en el Hospital Universitario Metropolitano, el primero con 35 semanas y el segundo con 21 semanas. Comprobándose el diagnóstico de ambos no sólo por el cuadro clínico, sino también por la prueba del torniquete y la positividad de las inmunoglobulinas. Anotamos que no encontramos documentación sobre pacientes con dengue hemorrágico y embarazo sin otra complicación, por lo tanto presentamos y sugerimos el manejo que realizamos, pues fue satisfactorio en las dos pacientes. Consideramos de suma importancia la divulgación de estos casos, ya que son muy escasos los reportes en la literatura sobre dengue y embarazo, y no exite un manejo estipulado para estas pacientes, a pesar de haber revisado las normas de la Organización Panamericana de la Salud (OPS)