PMC7463335_01
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.
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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).
x400 hematoxylin and eosin stained section (a) and Alcian blue special stain (b). Eosinophilic material of uncertain aetiology is present in some cells.
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Periodic acid-Schiff (PAS)/Alcian blue special stain was negative for mucin, but the stain highlighted the eosinophilic material (Figure 2).
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.
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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).