- Intramedullary benign cartilaginous neoplasms
- Ectopic hyaline cartilage rests in intramedullary bone.
- Lesions replace normal bone with mineralized or unmineralized hyaline cartilage, thereby generating a lytic area containing rings and arcs of chondroid calcifications.
- Lesions probably arise from cartilaginous rests that are displaced from the growth plate.
- Predilection for small bones of the hands and the feet (less commonly).
- Other locations are the long bones, shoulder, and pelvis.
- Metaphyseal region in the longer bones.
- Enchondromas tend to occupy the diaphyseal region in the short tubular bones
- Differential Diagnosis for enchondromas in the hands and feet
- Differential Diagnosis for enchondromas in long bones
- Clinical Presentation/Complications
- Painless swelling of a digit
- Pathologic fracture
- Malignant transformation
- Signs and Symptoms of Malignant Transformation
- Enlarging lesion
- Pathological fracture
- Soft tissue mass
- Disappearance of preexisting calcifications
 Imaging Findings
 Plain Film
- Lesions in hands in feet:
- Well defined lytic lesion with lobulated contours
- Endosteal erosion
- Some degree of calcification may be present
- Lesions in long bones
- Lesion with “arcs and rings” chondroid matrix
- Same as radiographic features
- Well defined with lobulated contours
- Endosteal erosion
- Chondroid matrix
- T1: low signal intensity
- T2: high signal intensity
- Calcified foci appear as low signal intensity on T1 and T2 images
Patient #1: Enchondroma with a pathological fracture
 See Also
 External Links
- Flemming DJ, Murphey MD. Enchondroma and chondrosarcoma. Semin Musculoskelet Radiol. 2000;4(1):59-71.
- Manaster BJ, Disler D, May D. Musculoskelatal Imaging: The Requisites. 2nd Edition. Mosby, 2002.
- Resnick, Donald. Diagnosis of Bone and Joint Disease. 4th Edition. W.B. Saunders Company, 2002.
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