Age / Sex : 38 / M

Chief complaint : right hip pain


What is your diagnosis?

Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer)

Courtesy : 이슬기 (Seul Ki Lee), 성빈센트 병원(St. Vincent’s Hospital)

(Diffuse large B cell) lymphoma in bone

Discussion

Findings
1. CT shows near normal appearance of bone.
2. MRIs show bone marrow replacing lesion in right pelvic bone with extraosseous soft tissue mass. Note that the relative absence of cortical involvement in the presence of marrow involvement and soft tissue masses
3. Three years ago, MRIs showed bone marrow replacing lesion in the same site without extraosseous soft mass. The result of biopsy was inflammatory cell infiltration; there was discrepancy with imaging findings and possibly non-diagnostic result.

References
MR imaging characteristics in primary lymphoma of bone with emphasis on non-aggressive appearance Skeletal Radiol (2007) 36:937 – 944