Feline meningioma with extensive nasal involvement

Area of Science:

• Veterinary Neurology
• Comparative Oncology
• Diagnostic Imaging

Background:

• Meningiomas are common primary brain tumors in cats, typically arising from the meninges.
• Extensive nasal cavity and cribriform plate involvement is an unusual presentation for feline meningiomas.

Observation:

• A 9-year-old domestic longhair cat presented with lethargy and pain, exhibiting a large extra-axial head mass on MRI.
• The mass demonstrated significant cribriform plate destruction, nasal invasion, and intracranial expansion with mass effect, causing herniation.

Findings:

• Magnetic resonance imaging (MRI) revealed characteristic signal intensities and marked contrast enhancement of the mass.
• Histopathological evaluation confirmed the diagnosis of a transitional (mixed) meningioma.

Implications:

• This is the first reported case of a feline meningioma with extensive nasal involvement.
• Meningioma should be considered in the differential diagnosis for feline nasal cavity tumors with frontal lobe and cribriform plate involvement.