Diffuse Infiltrating Perisellar Mass Mimicking Polyneuritis Cranialis

Key Points

• To describe a rare case of primary bony skull base DLBCL presenting as perisellar infiltration causing complex oculomotor dysfunction.
• Case report detailing imaging findings and clinical presentation.
• Use of skull base MRI for diagnosis.
• Exploration of CSF-based molecular markers for additional diagnostic support.
• Primary bony skull base DLBCL was confirmed via imaging and molecular analysis.
• Oculomotor dysfunction linked to perisellar infiltration was highlighted.
• Skull base MRI proved essential for accurate diagnosis of cranial neuropathy.