PT - JOURNAL ARTICLE AU - Namrah Siddiq AU - Colin Bergstrom AU - Larry D Anderson, Jr AU - Srikanth Nagalla TI - Bleeding due to acquired dysfibrinogenemia as the initial presentation of multiple myeloma AID - 10.1136/bcr-2019-229312 DP - 2019 Jul 01 TA - BMJ Case Reports PG - e229312 VI - 12 IP - 7 4099 - http://casereports.bmj.com/content/12/7/e229312.short 4100 - http://casereports.bmj.com/content/12/7/e229312.full SO - BMJ Case Reports2019 Jul 01; 12 AB - Patients with multiple myeloma (MM) are at risk for acquired dysfibrinogenemia resulting in laboratory abnormalities and/or bleeding complications. We describe a 63-year-old man who presented with bleeding diathesis in the presence of a low fibrinogen activity level with a normal fibrinogen antigen level. Further studies revealed elevated levels of lambda free light chains, and he was diagnosed with MM. Despite initiating treatment with bortezomib/dexamethasone, he continued to have recurrent bleeds along with hypofibrinogenaemia, prompting a switch to carfilzomib/dexamethasone. The patient responded with improvement in bleeding symptoms, normalisation of fibrinogen activity and a decrease in serum free light chains.