We describe a case of penetration injury caused by a nail-gun nail that remained in the temporal fossa for about 3 years. A 55-year-old man was referred to our hospital because of a foreign body in the temporal fossa. He had not noticed that there was a foreign body in the temporal fossa after falling down with a nail-gun 3 years previously. Computed tomography confirmed that the foreign body was located in bone. The patient was given local anesthesia, and a long nail was removed. After nail removal, slight bleeding and pyorrhea occurred. However, there was no leakage of spinal fluid. He was discharged 5 days after nail removal. No complications have occurred 6 months after nail removal. In addition, there were no postoperative symptoms.
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