PMC9417109_01
Preoperative CT scans and T2-weighted MRI of the sinuses. The area surrounded by the arrowhead indicates the lesion. (A) Coronal CT, (B) Axial CT, (C) Sagittal CT, and (D) T2-weighted MRI. CT, computed tomography; MRI, magnetic resonance image.
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F1
A computed tomography (CT) scan of the sinus revealed an egg-shaped lesion with a well-defined border centered on the lower half of the nasal cavity and hard palate, 32 mm x 28 mm x 36 mm in size (Figures 1A,C). T2-weighted magnetic resonance imaging (MRI), the lesion showed a uniform high intensity (Figure 1D). These findings were consistent with those of the NPDC.
Intraoperative endoscopic images and schematic view. (A) Right nasal cavity at the beginning of the operation. (B) Left nasal cavity at the beginning of the operation. (C) Right nasal cavity after L-shaped mucosal incision. (D) Right nasal cavity after resection of the nasal part of the cyst. (E) Right nasal cavity after marsupialization of the cyst. (F) Schematic view of the surgery. INT, inferior nasal turbinate; MS, maxillary sinus; NS, nasal septum.
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F2
Large bulges from the nasal septum to the nasal floor were observed on the right side, and only slight bulges were observed on the left (Figures 2A,B). An L-shaped mucosal incision was made from the right side of the nasal septum to the nasal floor (Figure 2C). The exposed bone surface of the lateral wall of the nasal cavity was covered with a pedicled mucoperiosteal flap (Figures 2D,F).
Hematoxylin and eosin-stained section of the resected cyst (scale bar = 250 mum). (A, B) Show weakly and highly magnified images, respectively. The cyst was lined by a stratified squamous epithelium with dense lymphocyte infiltration and fibrous tissue under the epithelium.
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F3
Histopathological examination revealed stratified squamous epithelium with dense lymphocyte infiltration, fibrous tissue under the epithelium, and no atypical cells (Figures 3A,B).
Images 3 months after surgery. The area surrounded by the arrowhead indicates a surgically opened area. (A) CT scan of the sinuses. (B) Endoscopic image of the right nasal cavity. CT, computed tomography; INT, inferior nasal turbinate; MNT, middle nasal turbinate; NS, nasal septum.
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F4
Three months after surgery, the marsupialized cyst remained patent (Figures 4A,B).