A Rare Presentation of Multiple Myeloma With Spontaneous Haematoma.

Multiple myeloma (MM) typically presents with characteristic symptoms such as bone pain, hypercalcaemia, renal dysfunction, and anaemia. However, atypical presentations of MM, though rare, have been reported. These atypical presentations pose a diagnostic challenge due to their varied clinical manifestations, leading to potential delays in diagnosis and treatment initiation. We present the case of a 75-year-old woman who presented to the emergency department with a spontaneous haematoma on the dorsal aspect of her left hand and wrist. Despite lacking classical symptoms of MM, such as bone pain or renal dysfunction, laboratory investigations revealed abnormal findings, including high serum protein levels, low albumin, and abnormal immunoglobulin levels. Serum protein electrophoresis and immunotyping confirmed a diagnosis of MM, specifically the immunoglobulin-G lambda type. Additionally, urine protein electrophoresis further supported the diagnosis. Imaging studies did not show radiological evidence of myeloma. The absence of classical symptoms in our patient underscores the importance of considering MM in the differential diagnosis of atypical cutaneous presentations. Laboratory investigations, particularly serum protein electrophoresis and immunotyping, played a crucial role in establishing the diagnosis. The patient was treated with pulsed dexamethasone and plasmapheresis, followed by initiation of VCD chemotherapy protocol. Atypical presentations of MM present diagnostic challenges for clinicians. Our case highlights the importance of maintaining a high index of suspicion for MM, even in the absence of classical symptoms. Early recognition and diagnosis are essential for prompt management and improved patient outcomes. Clinicians should remain vigilant for atypical presentations of MM to ensure timely intervention and treatment initiation.