A large mandibular tumor with a distinct radiological "sun-ray effect" as the primary manifestation of multiple myeloma.

The significant feature of the reported case was that of a sinister-looking mandibular tumor highly suggestive of a metastatic lesion or of osteogenic sarcoma. A biopsy specimen and results of a thorough medical work-up showed the lesion to be multiple myeloma. The myeloma cells apparently have the capability to stimulate osteoblastic activity and new bone formation. This capability should be kept in mind when making the differential diagnosis of osteoblastic bony lesions of the jaws.