[Evaluation of radiological methods for detection of wood foreign body in animal model].
OBJECTIVE
To determine the usefulness of different radiological methods in the diagnoses of wooden foreign bodies (FB).


METHODS
Eleven adult chickens were used. Each thigh received a puncture wound and in one of them a wooden splinter was introduced and left in place while in the contralateral it was introduced and removed (control group). After 7 days the animals where killed and the legs removed to be analyzed with conventional radiography (CR), ultrasonography (US), magnetic resonance and computed tomography. The results were viewed by 2 independent senior radiologists.


RESULTS
Sensitivity was: CR--13.6%; US--63.6%; MR--59.1%; and CT--72.7%, with specificity of 100%, 100%, 95.5%, and 95.5%, respectively. The positive predictive value for CR and US was 100%, 95% for CT 95% and 93.8% for MR. CT had a negative predictive value of 78.3%, while US, MR, and CR had 73.7%, 70.1%, and 53.7%, respectively. The accuracy for CT was 84.1%, followed by US--81.8%, RM--77.3%, and CR--56.8%. Inflammatory reaction was histologically demonstrated in all thighs containing FB.


CONCLUSIONS
CR showed a poor performance to detect wooden FB in chickens, while US and CT seem to be the best option, followed by RM.
Venter
Neil Grant
NG
UFRJ. neilventer@terra.com.br
Jamel
Nelson
N
Marques
Ruy Garcia
RG
Djahjah
Flavia
F
Mendonça
Leonardo de Souza
Lde S
D000818:Animals; D002645:Chickens; D005547:Foreign Bodies / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005549:Foreign-Body Reaction / Q000473:pathology; D008279:Magnetic Resonance Imaging; D023421:Models, Animal; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017695:Soft Tissue Injuries / Q000175:diagnosis / Q000000981:diagnostic imaging; D018709:Statistics, Nonparametric; D013848:Thigh / Q000000981:diagnostic imaging / Q000293:injuries*; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography; D014934:Wood; D014951:Wounds, Stab / Q000175:diagnosis* / Q000000981:diagnostic imaging