Retrospective evaluation of 377 patients with penetrating foreign body injuries: a university hospital experience (a present case of missed sponge foreign body injury) Background/aim: This study aimed to analyze retrospectively patients with FB injuries in our hospital and to present a patient with missed penetrating sponge FB injury. Materials and methods: This study covered 12 years (2008-2020) and reviewed all patients with FB injury who were admitted to the emergency department of our hospital. Besides our total results, we also present a case with missed penetrating sponge FB injury in detail. Results: 377 patients were included in the study (age 28.3 ± 18.3 years, m/f 229/148). Foot (n = 148, 39.3%) and hand (n = 143, 37.9%) were most frequently injured body parts. Regarding to the FBs types sewing needle (n = 140, 37.1%), metal pieces (n = 91, 24.1%) and glass (n = 80, 21.2%) were frequently observed objects. Most of the patients had been injured at home often by needles or glass. Injury-admission mean time was 7.38 ± 2.5 days. FBs frequently were removed in the emergency department (n = 176, 46.7%). Plain radiography is the first line in identifying FBs. Soft tissue infection was the most common complication. The MRI was much useful than USG in detecting of the missed penetrating sponge injury of the patient. Conclusion: For diagnosis of FBs, besides taking history from a patient, obtaining two-sided radiogram are of great importance. For non-radiolucent or deeply located FBs further clinical or radiological investigation must be considered to avoid complications. Although most of the FBs can be removed in the emergency department, depending upon the site of FB and age of the patient may require hospitalization and operation for its removal.