RESUMEN
BACKGROUND: Cystic angiomatosis is a rare benign disease presents with multiple lytic and sclerotic bone lesions mimicking a metastatic malignant neoplasia with less than 50 cases have been reported in literature so far. CASE PRESENTATION: We reported a case of a 48-year-old woman who presented to an oncology clinic with multiple lytic and sclerotic bone lesions. Oncologic investigation for metastatic malignant neoplasia started. After that the negative results were obtained by evaluating the primary tumor site, a final diagnosis of cystic angiomatosis was made according to bone biopsy results. CONCLUSIONS: Cystic angiomatosis is a rare disease with unpredictable prognosis. It can mimic metastatic malignancy especially when it presents at old age.