PT - JOURNAL ARTICLE AU - Preeti P Nair AU - Harshkant P Gharote AU - Shaji Thomas AU - Guruprasad R AU - Neha Singh TI - Brown tumour of the jaw AID - 10.1136/bcr.07.2011.4465 DP - 2011 Dec 09 TA - BMJ Case Reports PG - bcr0720114465 VI - 2011 4099 - http://casereports.bmj.com/content/2011/bcr.07.2011.4465.short 4100 - http://casereports.bmj.com/content/2011/bcr.07.2011.4465.full AB - Brown tumours are classic bony lesions that arise as a result of the effect of parathyroid hormone on bone tissue in some patients with hyperparathyroidism. They are erosive bony lesions caused by rapid osteolysis and peritrabecular fibrosis, resulting in a local destructive phenomenon. Facial skeleton is involved in about 2% of all cases of which the mandible is frequently affected. A 35-year-old female who was diagnosed with osteomalacia and brown tumour in posterior mandible as the sign of secondary hyperparathyroidism secondary to vitamin D deficiency is presented.