The Rationale: Foreign body (FB) in the nasal cavities is a frequent cause of otolaryngology emergency consultation that sometimes requires surgical treatment. When there is involvement of the posterolateral wall of the maxillary sinus (MS) and of the pterygopalatine fossa (PPF), conventional techniques such as antrostomy and medial endoscopic maxillectomy may not allow sufficient domination of the surgical field. Patient Concerns: We report the case of a woman who suffered from intranasal trauma with epistaxis and pain. Diagnosis: A computed tomography scan revealed a metallic FB at the level of the right posterolateral wall of the MS, PPF, and greater wing of the sphenoid bone. Treatment and Outcome: A minimally invasive transnasal endoscopic prelacrimal approach was chosen for its removal. Take-away Lessons: The postoperative recovery was rapid and without complication.