case_images: PMC6604121_01
case_images: Initial non-contrast CT sinus coronal view demonstrating intranasal foreign
  body displacing the cribriform plate. CT indicates computed tomography.
case_images: 10.1177_1179550619858606-fig1.jpg
case_images: PMC6604121_01_10.1177_1179550619858606-fig1.jpg
case_images: fig1-1179550619858606
case_images: Non-contrast computed tomography (CT) sinus confirmed the foreign body with dehiscence of anterior cranial fossa (Figures 1 and 2).
case_images: Initial non-contrast CT sinus sagittal view demonstrating size and position
  of intranasal foreign body, identifiable as a radiopaque screw. CT indicates
  computed tomography.
case_images: 10.1177_1179550619858606-fig2.jpg
case_images: PMC6604121_01_10.1177_1179550619858606-fig2.jpg
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case_images: Non-contrast computed tomography (CT) sinus confirmed the foreign body with dehiscence of anterior cranial fossa (Figures 1 and 2).
case_images: Postoperative non-contrast CT sinus sagittal view after removal of foreign
  body demonstrating persistent elevation of anterior skull base. CT indicates
  computed tomography.
case_images: 10.1177_1179550619858606-fig3.jpg
case_images: PMC6604121_01_10.1177_1179550619858606-fig3.jpg
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case_images: Repeat CT scan showed elevation of the skull base and no pneumocephalus (Figure 3).
case_images: Postoperative MRI coronal view with arrow demonstrating leptomeningeal
  enhancement but no encephalocele or other pathology. MRI indicates magnetic
  resonance imaging.
case_images: 10.1177_1179550619858606-fig4.jpg
case_images: PMC6604121_01_10.1177_1179550619858606-fig4.jpg
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case_images: Post-operative magnetic resonance imaging (MRI) showed some leptomeningeal enhancement but no encephalocele (Figure 4).
case_images: Endoscopic image at 6-month follow-up showed patent ethmoid and frontal
  sinuses with synechia.
case_images: 10.1177_1179550619858606-fig5.jpg
case_images: PMC6604121_01_10.1177_1179550619858606-fig5.jpg
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case_images: Ethmoid and frontal sinuses were patent, but the maxillary sinus opening was not visualized (Figure 5).