[AT THE BOTTOM OF THE ULCER - THE IMPORTANCE OF A BIOPSY IN DIAGNOSING HARD TO TREAT ULCERS].

INTRODUCTION: We report a case of a patient who presented with bilateral chronic painful necrotic leg ulcers. A skin biopsy revealed histopathological findings compatible with calciphylaxis, a rare phenomenon accompanied by high morbidity and mortality. Treatment options are limited and are based mainly on case reports and small series, so further research is needed in this area. This case highlights the importance of a skin biopsy in the diagnosis of chronic ulcers.