Incidental Enchondromas Of The Lower Extremity Long Bones And Atypical Chondroid Tumors Differentiation Based On Hounsfield Units
Orhan Balta1, Harun Altinayak2, Eyup Cagatay Zengin1, Mehmet Burtac Eren1, Osman Demir3, Kursad Aytekin41Department of Orthopaedics and Traumatology, Gaziosmanpasa University Hospital, Tokat, Turkey, 2Department of Orthopedics and Traumatology, Samsun Training and Research Hospital, Health Sciences University, Samsun, Turkey, 3Department of Biostatistics, Tokat Gaziosmanpasa University, Medical Faculty,, Tokat, Turkey, 4Departments of Orthopedics & Traumatology and Anatomy, University of Giresun, School of Medicine,, Giresun, Turkey
Objectives:To determine the prevalence of enchondroma (EC) in adults, which was detected as an incidental finding in the lower extremity long bones on magnetic resonance imaging (MRI) and to detect imaging differences between EC and atypical chondroid tumor (ACT). Methods: A retrospective review of lower extremity MRI scans was performed in patients over 18 years of age. The location, size, and appearance of ECs and ACTs were established. The patients who were diagnosed with definitive EC and ACT after undergoing a biopsy were evaluated whether they had computed tomography (CT) examinations. Sagittal, coronal and axial reconstructions were performed in the patients with CT. Overall, minimum and maximum Hounsfield Units measurements were conducted in all 3 planes using region-of-interest (ROI) circles. Results: A total of 20,864 MR scans were reviewed. EC was detected in 2.2% and ACT in 0.08% of all MRIs including the lower extremity long bones. EC was observed to be most in the MR images taken for the knee (2.209%). EC was detected to be 1.6% in the proximal femur, 1.9% in the femur diaphysis, 1.8% in the distal femur, and 0.4% in the proximal tibia. Conclusion: The present study showed that tumors may be significant for ACT if their length is more than 4.5 cm, their width is greater than 2 cm, and they are growing more than 6 mm at follow-up. It was determined that the lower the CT attenuation measurements (Hounsfield Units), the higher the probability of having ACT. Keywords: Hounsfield Units, enchondroma, Atypical Chondroid Tumors, CT, MAGNETIC RESONANCE IMAGING, attenuation value, CT
Cite This Article
Balta O, Altinayak H, Zengin E, Eren M, Demir O, Aytekin K. Incidental Enchondromas Of The Lower Extremity Long Bones And Atypical Chondroid Tumors Differentiation Based On Hounsfield Units. EJMI. 2022; 6(2): 245-258
Corresponding Author: Orhan Balta