RESUMEN
Brown tumours caused by vitamin D deficiency are rare. Most cases are caused by primary hyperparathyroidism, and are rarely caused by secondary hyperparathyroidism in cases of renal failure. We present a case of Brown tumours of the tibia and second metacarpal bone in a 50-year-old woman who had a low dietary intake of vitamin D and had worn a veil for most of her adult life. The Brown tumours were caused by vitamin D deficiency and secondary hyperparathyroidism. The patient improved on treatment with vitamin D3 and calcium supplements. This is a rare case and the first, to our knowledge, with a Brown tumour of the tibia caused by vitamin D deficiency due to decreased dietary intake and decreased exposure to sunlight. The course of treatment and investigations of the patient are described.