case_images: PMC11143867_01
case_images: Large expansile mass in the infratemporal fossa and pterygopalatine fossa. (A) T1 weighted MRI with contrast showing a rim enhancing cystic lesion centered within the left pterygopalatine and infratemporal fossa and a non-contrasted CT sinus showing a 3.1 cm by 1.7 cm expansile lesion centered within the left pterygopalatine fossa without aggressive features. (B) Intraoperatively a large cystic mass was identified expanding the posterior wall of the maxillary sinus. The tumor can be seen on the posterior maxillary sinus wall, displacing it anteriorly and in close proximity of the neurovascular bundle.
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case_images: A sinus CT showed a 3.1 x 1.7 cm2 expansile lesion centered within the left pterygopalatine fossa without aggressive features (Figure 1). It was also in very close proximity to the left sphenopalatine artery and the maxillary branch of the trigeminal nerve as seen in Figure 1.
case_images: Histology reveals a mature teratoma. Pathology revealed a mature teratoma characterized by minor salivary glands, sino-nasal mucosa, and pancreatic tissue with exocrine cells and islets.
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case_images: The tumor tested negative for GFAP, and neurofilament as seen in Figure 2.
case_images: MRI (T2 weighted) at diagnosis demonstrates a cystic mass centered in the ITF extending into the inferior orbital fissure. Repeat MRI (2 years post-operative) demonstrates stable resection with minimal residual tumor in the infraorbital fissure. The sphenoid sinus is pneumatizing with circumferential edematous mucosa.
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case_images: Her latest MRI shows a small remnant of teratoma (Figure 3) that has been stable and will continue to be monitored with MRI imaging.