Plasmacytoma - lateral tibial plateau

Case contributed by Dr Chris O'Donnell


Known paraproteinuria. 6 weeks of pain and swelling in the lateral knee. No history of trauma.

Patient Data

Age: 60 years
Gender: Female

Subtle lytic lesion in the lateral tibial plateau without cortical breach or bone expansion.

Well-defined mass with slightly lobulated margins in the lateral tibial plateau with surrounding soft tissue edema.  No expansion of bone nor cortical destruction.  Only minor adjacent bone marrow edema laterally.

Case Discussion

This is an unusual location for a solitary deposit of myeloma (plasmacytoma).  The lack of bone expansion is also unusual.  Differential diagnosis would include giant cell tumor and metastasis.

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Case information

rID: 45778
Published: 7th Jun 2016
Last edited: 22nd Jul 2020
Inclusion in quiz mode: Included