Management of Incidental Enchondroma Detected on Radiographs

Initial Radiographic Assessment

Radiographs are the primary imaging modality for characterizing primary bone tumors, providing essential details on lesion location, size, shape, margins, periosteal reaction, and matrix mineralization. American College of Radiology recommendation. 1
In typical enchondromas, plain radiographs achieve a correct diagnostic rate of ≈ 67 %. American College of Radiology data. 2

Magnetic Resonance Imaging (MRI) does not improve overall diagnostic accuracy for typical enchondromas; radiographs remain superior (67 % vs. 57.8 % correct diagnosis). American College of Radiology evidence. 3
MRI may increase both true‑positive and false‑positive diagnoses for cartilaginous lesions, potentially leading to unnecessary interventions. American College of Radiology observation. 3

MRI is warranted only when radiographic features are concerning or when the patient develops symptoms. American College of Radiology guideline. 4
New pain after skeletal maturity should prompt MRI evaluation. Praxis Medical Insights recommendation. 5
Presence of aggressive radiographic signs (cortical destruction, soft‑tissue mass, periosteal reaction) is an indication for MRI. American College of Radiology guidance. 1
Lesion size concerns—particularly when assessment of cartilage cap thickness is needed—justify MRI. Praxis Medical Insights suggestion. 5
Indeterminate or atypical radiographic appearance should be further evaluated with MRI. American College of Radiology advice. 4

MRI demonstrates a sensitivity of 61 % and specificity of 95 % for distinguishing benign from malignant cartilaginous lesions. American College of Radiology data. 4

Surgical curettage of enchondroma carries a complication rate of ~23 % and has not shown superiority over observation alone. American College of Radiology findings. 3
Overreliance on MRI can produce false‑positive diagnoses, leading to unnecessary surgical procedures due to overlapping imaging features between enchondroma and low‑grade chondrosarcoma. American College of Radiology warning. 3

Large enchondromas that pose a risk of pathological fracture should be referred to orthopedic oncology for specialist evaluation. (American College of Radiology) 6
Enchondromas with indeterminate malignant potential (e.g., large size with concerning imaging features) warrant referral to orthopedic oncology. (American College of Radiology) 6
Symptomatic complications such as stress fracture, secondary aneurysmal bone cyst formation, or suspected malignant transformation require orthopedic oncology assessment. (American College of Radiology) 7

Asymptomatic enchondromas confirmed by MRI do not require oncology referral and need no further imaging or intervention. (American College of Radiology) 6
Incidental asymptomatic lesions with benign radiographic features should be managed with observation alone, without specialist referral. (American College of Radiology) 6
Benign‑appearing lesions on plain radiographs that are asymptomatic do not require additional imaging evaluation. (American College of Radiology) 7

MRI increases both true‑positive and false‑positive diagnoses for cartilaginous lesions (≈58 % correct for enchondroma vs. ≈67 % for radiographs), potentially leading to unnecessary interventions. (American College of Radiology) 8

Clinical observation with routine follow‑up is appropriate for asymptomatic, radiographically benign enchondromas. (American College of Radiology) 7
Routine repeat imaging is not indicated for definitively benign, asymptomatic enchondromas. (American College of Radiology) 6