PT - JOURNAL ARTICLE AU - Lakshmana Perumal, Nandhini AU - Selvi, Jayakumar AU - Sahoo, Jaya Prakash AU - Kamalanathan, Sadishkumar TI - An unusual cause of pulmonary calcification AID - 10.1136/bcr-2019-229725 DP - 2019 Jun 01 TA - BMJ Case Reports PG - e229725 VI - 12 IP - 6 4099 - http://casereports.bmj.com/content/12/6/e229725.short 4100 - http://casereports.bmj.com/content/12/6/e229725.full SO - BMJ Case Reports2019 Jun 01; 12 AB - Metastatic pulmonary calcification (MPC) is an uncommon entity resulting from abnormalities in calcium-phosphorus homoeostasis. Most cases reported in the literature are among patients with chronic kidney disease receiving haemodialysis. Primary hyperparathyroidism is a relatively common condition affecting calcium homoeostasis, in which MPC can rarely occur. We report the case of one such patient who presented with severe hypercalcaemia and features of interstitial lung disease. Radiographic imaging was normal and the diagnosis was clinched by diffuse pulmonary uptake in 99mTechnetium-methylene diphosphate scan.