Prakash Sharma^1,, Prasanna Ghimire², Amar Gurung³, Chandra Bahadur Mishra⁴, Subita Lalchan¹, Subash KC¹, Merina Gyawali¹, Prabhat Kumar Tiwari¹

Ultrasound is effective in localization and removal of foreign body. This study was done to evaluate the role of ultrasonography in localization of foreign body and to compare the ultrasound guided foreign body removal with that of conventional surgical exploration without ultrasound guidance. This prospective study was conducted between September 2013 and July 2015. Patients more than 14 years of age old with clinical suspicion of retained foreign body were included in our study. Ultrasonography was done using 7.5 to 10 MHZ probe in Sonoace X6 and Logiq P3 machines. After exact localization patients were randomly selected into two groups. In the first group, removal was done using ultrasonography guidance by a radiologist using a standard technique. In the second group, removal was done by referring surgeon. Statistical analysis was done using SPSS 18. Age of the patients ranged from 15 to 85 years with the mean age of 37.7±17.7 years. M: F ratio was 2.2:1. Most common location of retained foreign body was foot. Most common type of retained foreign body was wooden piece. Sensitivity of ultrasound in detection of retained foreign body was 96.8%. There was no statistical difference between the length of foreign body as measured by ultrasonography before removal and by scale after removal. Duration required for removal of foreign body under ultrasonography guidance was significantly less. Post-operative scar was smaller in patients with ultrasound guided removal. In conclusion, ultrasound has a sensitivity of 96.8% in localization of foreign body. Ultrasonography guided removal of foreign body reduces the operation time with reduction in the post-operative scar.

foreign body, removal, ultrasonography