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Fluid-fluid levels in a simple bone cyst on magnetic resonance imaging
E J Maas1, J G Craig, P K Swisher
1Department of Radiology, Henry Ford Hospital, Detroit, MI 48202, USA.
Australasian Radiology
|September 4, 1998
Summary
This case report details a rare simple bone cyst (SBC) in the distal femur exhibiting fluid-fluid levels on MRI and a cementum-like substance microscopically. This finding is uncommon for SBCs, which typically present differently.
Area of Science:
- Orthopedic Surgery
- Radiology
- Pathology
Background:
- Simple bone cysts (SBCs) are typically benign bone lesions, often found in the proximal humerus and femur.
- Diagnostic features of SBCs include a cementum-like matrix on microscopy, present in about 10% of cases.
- Fluid-fluid levels on MRI are more commonly associated with other bone pathologies like aneurysmal bone cysts.
Observation:
- An unusual case of simple bone cyst (SBC) was identified in the distal femur.
- The SBC exhibited characteristic fluid-fluid levels on magnetic resonance (MR) imaging.
- Microscopic examination revealed a cementum-like substance, a hallmark of SBC.
Findings:
- This presentation is atypical for SBC, as fluid-fluid levels are rarely reported in these lesions.
- A literature review found only one prior case of SBC with multiple fluid levels on MRI.
- The presence of a cementum-like matrix confirmed the diagnosis of SBC.
Implications:
- This case expands the known imaging and histopathological spectrum of simple bone cysts.
- It highlights the importance of considering SBC in the differential diagnosis of bone lesions with fluid-fluid levels.
- Further research may clarify the pathogenesis of fluid-fluid levels in SBCs and their clinical significance.