Extract
Previously regarded as a distinct tumor type representing the most
common adult soft-tissue
sarcoma1,2,
the term malignant fibrous histiocytoma is now reserved for a small group of
undifferentiated pleomorphic
sarcomas3. The tumor
is most often primary, but rare cases of secondary malignant fibrous
histiocytoma in burn
scars4-8
or infected or noninfected surgical
scars9-12
have been reported (see Appendix). Secondary malignant fibrous histiocytoma
has been described in contact with
prostheses13-28,
osteosynthesis
material29-35,
or implanted Dacron
grafts36. Malignant
degeneration of benign
tumors35, Paget
disease37, osseous
infarcts38, or
fibrous dysplasia39
also has been reported (see Appendix). We report a unique case of a patient
with soft-tissue malignant fibrous histiocytoma that developed on the medial
side of the knee six years after arthroscopic reconstruction of the anterior
cruciate ligament with use of the patellar tendon.