case_images: PMC6398039_01
case_images: Preoperative images. Left fronto-orbital fistula draining into the supra-medial orbit.
case_images: CRIOT2019-9437641.001.jpg
case_images: PMC6398039_01_CRIOT2019-9437641.001.jpg
case_images: fig1
case_images: At presentation, he suffered from recurrent sinonasal disease with left-sided headache and left fronto-orbital fistula discharge over his medial canthus (Figure 1).
case_images: CT orbit, sinuses, and skull base. Small A-P diameter of frontal sinus with extensive neo-osteogenesis secondary to chronic frontal sinusitis.
case_images: CRIOT2019-9437641.002.jpg
case_images: PMC6398039_01_CRIOT2019-9437641.002.jpg
case_images: fig2