PMC6611016_01
A, Axial CT image showing the mass originated from the posterior aspects of the left inferior turbinate, extending into the postnasal space. B, Coronal CT image: the opacification in the left maxillary sinus was a simple retention cyst not an extension of the tumor. There are also subtle reactive bone changes within the left inferior turbinate and lateral wall as compared to the contralateral side. C, Axial magnetic resonance imaging (MRI) T2-weighted image shows soft tissue density mass in the left maxillary sinus, which is hyperintense postcontrast enhancement and is seen closely abutting the left inferior turbinate extending posteriorly into the nasopharynx. D, Coronal MRI T1-weighted image shows soft tissue density mass in the left maxillary sinus, which is isointense to the adjacent skeletal muscle.
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A magnetic resonance imaging was also organized after the initial diagnostic work-up which demonstrated similar findings to the initial CT images (See Figure 1).
A, Amyloid on Congo red (x100) showing red stain of the amorphous eosinophilic material. B, Apple-green birefringence under high-intensity cross-polarized light (x100).
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It exhibited large deposits of amorphous eosinophilic material and the presence of amyloid on Congo-red staining with apple-green birefringence when viewed with polarized light (See Figure 2).