Cystic changes in desmoplastic fibroma of bone: a new MRI finding.
OBJECTIVE
To evaluate the magnetic resonance imaging features of desmoplastic fibroma (DF) of bone.


METHODS
Two radiologists retrospectively evaluated imaging findings of pathologically confirmed DFs in eight patients. Involved sites and longitudinal location in long bones were evaluated using radiography and computed tomography (CT). At MRI, the presence of low signal areas on T2-weighted images (low-T2), enhancement, cystic changes, and locations of the mass were evaluated. The location of masses was evaluated, based on cortical disruption and adjacent soft-tissue extension.


RESULTS
Involved sites were the femur in three patients, the tibia in two, and the humerus, fibula, and pubic bone in one each. Of the seven masses in the long bones, three were located in the epi- and metaphysis, two in the meta- and diaphysis, one in the diaphysis, and one in the epiphysis. Seven masses had areas of low T2-weighted or heterogeneous enhancement, and three (38%) showed cystic changes. cortical disruption was seen at MRI in six of eight patients (88%).


CONCLUSIONS
DFs contained cystic change. Cortical disruption may also occur, which may cause confusion with malignant lesions.
Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, South Korea.
S Y
SY
Kim
H W
HW
Chung
S Y
SY
Lee
S H
SH
Hong
J Y
JY
Hwang
M-J
MJ
Kim
D000328:Adult; D000368:Aged; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D018220:Fibroma, Desmoplastic / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed