bariatric surgery and mental disordersMedical treatments have shown poor outcomes, bariatric surgery has become a frequent treatment alternative for obesity. Obese patients seeking treatment have higher psychiatric comorbidity than not consulting ones. Bariatric surgery has allowed a reduction in medical comorbidity and some improvement in pre surgery psychopathology. Recent evidence reports a decrease in depressive disorders rate, improvement in self-esteem and life quality, in direct association with weight reduction, with no significant anxiety changes. Although weight decrease should help to have a better social life, important difficulties in adapting to the new environment can emerge. An increase in suicides and problematic alcohol use has been observed, as well as a decrease in binge eating disorder with further appearance of compensatory behavior, distorted body image, and marital problems. Pre surgery personality disorder could be a risk factor for a negative outcome. In this context a rigorous post surgery follow up is desirable, in order to optimize mental health benefits of massive weight reduction.Key words: Morbid Obesity, bariatric surgery, psychopathology, mental disorders. resumenLos tratamientos médicos de la obesidad han demostrado baja efectividad, lo que ha llevado a que la cirugía bariátrica se haya establecido como una alternativa de tratamiento cada vez más frecuente. Las personas obesas que buscan tratamiento presentan tasas significativamente elevadas de comorbilidades psiquiátricas en comparación con las personas obesas que no consultan. La cirugía bariátrica ha permitido una reducción de las comorbilidades médicas y una mejoría de las patologías psiquiátricas presentes antes de la cirugía. Publicaciones recientes reportan una disminución de los trastornos depresivos, mejoría de la autoestima y de la calidad de vida, directamente asociados a la reducción de peso, sin variaciones significativas en los niveles de ansiedad. Si bien la pérdida de peso debería ayudar al mejoramiento de la vida social del paciente, pueden surgir importantes dificultades para adaptarse al nuevo entorno. Se ha visto un aumento de la tasa de suicidios y del uso problemático de alcohol, disminución precoz del trastorno por atracones con Rev Chil Cir. Vol 67 -nº 4, Agosto; pág. 441-447 artículO de reVisiÓn *Recibido el 5 de noviembre de 2014 y aceptado para publicación el 29 de diciembre de 2014. Conflictos de Interés: ninguno.Correspondencia: Dr.

Pernio (chilblains) is an inflammatory condition classically characterized by localized erythema and swelling of acral sites upon exposure to cool and damp conditions. It is reported a case of a 59-year-old otherwise healthy woman with acute primary perniosis. She had a 3-day history of lesions on the toes brought on by cold, damp weather. On initial presentation, a biopsy sample was taken of a hallux lesion, and the patient was given a trial course of oral pentoxifylline, topical corticoid and nifedipine therapy. Follow-up at 2 weeks showed complete relief of symptoms and the biopsy results confirmed the diagnosis. Pentoxifylline therapy has been shown to be effective and should be considered the standard of care in the treatment of perniosis along with conservative environmental measures.The etiology and pathogenesis of perniosis are reviewed and discussed, as well as differential diagnoses and treatment options.