Chondromyxoid Fibroma Clinical Presentation
- Author: Hannah D Morgan, MD; Chief Editor: Harris Gellman, MD more...
History
Approximately 70% of patients have symptoms at the time of diagnosis. The remaining lesions are discovered incidentally. Pain is the most common symptom and may be present for years. While typically mild, the pain may become more severe with time, and night symptoms may be present. Patients may also report swelling and, in very rare cases, a limitation of joint motion.
Physical
Approximately 89% of CMFs involve the lower extremity. The proximal tibia is the most common location, followed by the distal femur, pelvis, and foot.[11] Long bones are involved much more frequently than are other bones, especially in younger patients. Flat bone involvement may be observed more often in older patients. Patients may have localized tenderness or swelling over the CMF lesion, and, in rare cases, they may incur a pathologic fracture.
Causes
Although no specific cause is known for CMF, some authors have noted an association with certain chromosomal abnormalities. In a study of 4 patients with CMF, Granter and colleagues found that all of the subjects had a clonal rearrangement of chromosome 6.[12] Each of these rearrangements involved band 6q13, which has not been associated with other bone tumors. Thus, band 6q13 may be useful as a cytogenetic marker to distinguish CMF from other histologically similar tumors. The authors suggested that oncogene activation resulting from this clonal rearrangement is likely to be involved in the genesis of CMF.[13]
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