case_images: PMC7463335_01
case_images: Pre-op MRI scan (coronal plane). Preoperative MRI T2 sequence showing the tumour measuring 40 x 23 mm obstructing the frontal sinus drainage pathway with infraorbital extension and bowing of the nasal septum.
case_images: CRIOT2020-3148125.001.jpg
case_images: PMC7463335_01_CRIOT2020-3148125.001.jpg
case_images: fig1
case_images: His magnetic resonance imaging (MRI) scans showed thinning of the medial wall of the right orbit, with evidence of a discrete mass arising from the right ethmoid sinus, extending into the right nasal cavity with likely impingement on the nasolacrimal duct (Figure 1).
case_images: x400 hematoxylin and eosin stained section (a) and Alcian blue special stain (b). Eosinophilic material of uncertain aetiology is present in some cells.
case_images: CRIOT2020-3148125.002.jpg
case_images: PMC7463335_01_CRIOT2020-3148125.002.jpg
case_images: fig2
case_images: Periodic acid-Schiff (PAS)/Alcian blue special stain was negative for mucin, but the stain highlighted the eosinophilic material (Figure 2).
case_images: Post-op MRI scan (coronal plane). Postoperative MRI T1 with gadolinium enhancement after 6 months of follow-up. Total tumour clearance and no evidence of residuum/recurrence are confirmed.
case_images: CRIOT2020-3148125.003.jpg
case_images: PMC7463335_01_CRIOT2020-3148125.003.jpg
case_images: fig3
case_images: Six months after the determination of this aetiology, a follow-up was conducted and an MRI was performed which showed no lesion residuum or recurrence (Figure 3).