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[Evaluation of radiological methods for detection of wood foreign body in animal model]
Neil Grant Venter1, Nelson Jamel, Ruy Garcia Marques
1UFRJ. neilventer@terra.com.br
Purpose:
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.
Conclusion:
CR showed a poor performance to detect wooden FB in chickens, while US and CT seem to be the best option, followed by RM.
