case_images: PMC11809602_01
case_images: Gaze positions demonstrating partial oculomotor nerve palsy with pupillary involvement in the right eye.
case_images: jmc-16-061-g001.jpg
case_images: PMC11809602_01_jmc-16-061-g001.jpg
case_images: F1
case_images: These findings, as depicted in Figure 1, suggested partial oculomotor nerve palsy with pupillary involvement and accompanying optic neuropathy, leading to a diagnosis of OAS in the right eye.
case_images: Magnetic resonance imaging (MRI) of the orbit: T2-weighted images demonstrate heterogeneous isointensity in the right superior, medial, and inferior rectus muscles, intraorbital fat, and perioptic nerve sheath complex, with post-gadolinium enhancement. No masses were detected in the paranasal sinuses (PNS). (a) Axial T2-weighted view. (b) Axial T1-weighted view with gadolinium enhancement. (c) Coronal T2-weighted view. (d) Coronal T1-weighted view with gadolinium enhancement. The yellow arrows indicate the position of the right optic nerve.
case_images: jmc-16-061-g002.jpg
case_images: PMC11809602_01_jmc-16-061-g002.jpg
case_images: F2
case_images: T2-weighted images involving the superior, medial, and inferior rectus muscles, perioptic nerve sheath, and intraorbital fat of the right eye. These findings extended through the orbital apex region, with gadolinium enhancement, as shown in Figure 2.
case_images: Histological and immunohistochemical images of the tumor. (a) The cells are positive for in situ hybridization for Epstein-Barr virus-encoded RNA (EBER) (x 40). (b) The cells are positive for CD3 staining (x 40). (c) The lymphocytes are positive for CD56 staining (x 40). (d) The lymphocytes are positive for TIA-1 staining (x 40).
case_images: jmc-16-061-g003.jpg
case_images: PMC11809602_01_jmc-16-061-g003.jpg
case_images: F3
case_images: TIA-1 and CD56, leading to extranodal NK/T cell lymphoma diagnosis. The histopathological and immunohistochemical findings are displayed in Figure 3.
case_images: Gaze positions demonstrating improvement of oculomotor nerve palsy in the right eye.
case_images: jmc-16-061-g004.jpg
case_images: PMC11809602_01_jmc-16-061-g004.jpg
case_images: F4
case_images: His best-corrected vision gradually improved, as did his ocular movement, as shown in Figure 4.