ss=""h4"">Objectives
To present the steps followed to reach the diagnosis of plasmocytoma in a patient with no relevant history who was diagnosed with a sacral mass at another center.
ss=""h4"">Material and methods
Retrospective evaluation of the imaging and clinical findings in a patient with no known relevant history who was diagnosed with a sacral mass at another center.
ss=""h4"">Results
The diagnostic workup included many different tests: Chest and abdominal CT found two paravertebral masses infiltrating the spinal canal, one in the thoracic spine and the other in the sacrum. No significant alterations were observed in the blood test: there was no anemia or leukocytosis. The only abnormal finding was K = 3.5. Fine-needle aspiration cytology of the right iliac bone yielded a cellular block with tissue compatible with bone marrow.
Histological study of the biopsy specimen from the paravertebral mass showed plasmocytoma. Magnetic resonance showed altered signal in several vertebral bodies, as well as two soft-tissue masses in the thoracic spine and sacrum. The differential diagnosis was between multiple myeloma and any other type of pasma cell tumor.
ss=""h4"">Conclusions
Multimodal diagnostic study made it possible to reach the definitive diagnosis of a nonspecific mass in the sacral region and to determine the extension of the disease. Although performed separately some techniques are inconclusive, in combination they can reach a definitive diagnosis.
