Rare Dual Malignancy: Simultaneous Multiple Myeloma and Osteosarcoma of the Mandible, Case Report
A recent clinical case has identified an unprecedented dual malignancy in the mandible, where multiple myeloma (MM) and osteosarcoma (OS) occurred simultaneously. The discovery represents only the fourth documented case globally and the first involving a female patient, highlighting a rare diagnostic intersection between hematologic and aggressive osteogenic cancers
These findings are published in the Journal of Indian Academy of Oral Medicine and Radiology in March 30, 2026, by Dr. Rajendra S. Birangane and colleagues from the Department of Oral Medicine and Radiology, P D U Dental College in Solapur, Maharashtra, India
The case is vital for clinical practice because it demonstrates that aggressive jaw lesions can harbor multiple primary malignancies, necessitating a departure from traditional single-diagnosis logic during patient evaluation. Clinicians must recognize that overlapping radiographic and histopathologic features require an exhaustive multidisciplinary investigation to ensure that both hematologic and primary bone cancers are accurately identified and treated.
A 30-year-old female presenting with chronic facial swelling and systemic weakness underwent imaging and laboratory testing that revealed multifocal bone destruction and Bence-Jones proteinuria, with histopathology confirming the simultaneous presence of Multiple Myeloma and Osteosarcoma. The patient was subsequently managed with a combination of surgical resection and adjuvant chemotherapy, and her clinical progress remains under ongoing monitoring to determine the final outcome.
The mechanistic insights suggest that the simultaneous proliferation of malignant plasma cells and neoplastic osteoblasts occurs within the hematopoietic-rich environment of the posterior mandible, creating a complex site of architectural destruction. This co-existence results in a unique hybrid lesion where the classic punched-out osteolytic patterns of hematologic cancer are interspersed with the aggressive cortical perforation and irregular bone formation characteristic of osteosarcomatous growth.
Thus, the report highlights the necessity for oral diagnosticians to maintain a high index of suspicion when encountering atypical jaw lesions that do not conform to standard diagnostic patterns or expected patient demographics. By documenting this rare occurrence in a young female, the study provides essential evidence for future research and underscores the critical importance of integrating radiologic, hematologic, and histologic findings in patient care.
Reference
Birangane RS, Chaudhari R, Birajdar KM, and Parkarwar P, regarding this dual mandibular malignancy, was published in the 2026 edition of the Journal of Indian Academy of Oral Medicine and Radiology, volume 38, specifically on pages 131 to 134
