Document Detail

Incidental enchondromas of the knee.
MedLine Citation:
PMID:  18492914     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of our study was to determine the prevalence of incidental enchondromas on routine MR knee imaging. MATERIALS AND METHODS: We retrospectively reviewed 449 consecutive routine knee MR examinations for the presence of enchondromas. MRI was considered positive when a focal geographic area of lobular marrow replacement (nonsubchondral) was identified on T1 weighting and high signal intensity was seen on T2 weighting. Patients with enchondromas were further evaluated for demographics; lesion site, size, and relationship to the physeal plate; aggressive imaging features described with chondrosarcoma; concurrent internal derangement; and study indication. RESULTS: The prevalence of incidental enchondromas was 2.9% on routine knee MR examinations. The prevalence was highest in the distal femur (2.0%), followed by the proximal tibia (0.7%) and the proximal fibula (0.2%). The average lesion size was 1.9 x 1.2 x 1.3 cm (57% of lesions were < 1 cm). Most lesions were located in the metaphysis (71%) or diaphysis (21%). Enchondromas were within 1.5 cm of the physeal plate in 72% of cases. No aggressive imaging features to suggest chondrosarcoma were seen. All patients had evidence of internal derangement as the cause of symptoms and the request for imaging. CONCLUSION: Incidental enchondromas can be identified on 2.9% of routine MR knee examinations, most frequently in the distal femur (2.0%). This significant prevalence is much higher than in an autopsy series (0.2%), likely reflecting the increased sensitivity of MRI for detecting small lesions, and is important to recognize to avoid confusion with other pathologic entities.
Michael J Walden; Mark D Murphey; Jorge A Vidal
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  AJR. American journal of roentgenology     Volume:  190     ISSN:  1546-3141     ISO Abbreviation:  AJR Am J Roentgenol     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-21     Completed Date:  2008-06-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7708173     Medline TA:  AJR Am J Roentgenol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1611-5     Citation Subset:  AIM; IM    
Department of Radiology, Walter Reed Army Medical Center, Washington, DC 20306, USA.
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MeSH Terms
Aged, 80 and over
Bone Neoplasms / diagnosis*,  epidemiology*
Chondroma / diagnosis*,  epidemiology*
Incidental Findings
Knee / pathology*
Magnetic Resonance Imaging / statistics & numerical data*
Middle Aged
Retrospective Studies
Risk Factors
United States / epidemiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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