Resumo

DIEHL, María et al. Osteosclerosis associated to systemic mastocytosis. Acta bioquím. clín. latinoam. [online]. 2016, vol.50, n.3, pp.429-434. ISSN 0325-2957.

Mastocytosis is a rare disease defined by abnormal clonal mast-cell expansion and accumulation in various tissues. The disease affects the skeleton in 60-70% of cases. Radiological abnormalities are usually diffuse and the lesions mainly involve the axial skeleton. Osteopenia is the most frequent form, but it can also occur as osteosclerosis or a combination of both disease expressions. In this report, a 74-year old male patient with osteosclerosis associated to systemic mastocytosis is presented. Laboratory tests showed an elevation in bone turnover markers with a greater increase in bone formation markers. Bone densitometry depicted a marked increase in mineral density and X-rays showed osteoesclerosis. A trans-iliac bone biopsy described the presence of dense, multifocal infiltrates of mast cells and bone marrow fibrosis. Bone histomorphometry showed a marked increase in bone formation and resorption parameters. Treatment with loratadine, corticosteroids, á interferon, calcium and calcitriol was initiated. The patient improved, bone turnover markers normalized and bone mineral density decreased after 30 months. The importance of considering systemic mastocytosis in the differential diagnosis of patients with osteosclerosis or osteoporosis.

Palavras-chave : Systemic mastocytosis; Osteoesclerosis.

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