Brainstem ischemic syndrome in juvenile NF2.

Area of Science:

• Neurology
• Genetics
• Vascular Medicine

Background:

• Neurofibromatosis type 2 (NF2) is a genetic disorder predisposing individuals to tumor development.
• Brainstem stroke is an uncommon manifestation, particularly in young, undiagnosed NF2 patients.

Purpose of the Study:

• To report a novel case of brainstem ischemic necrosis in a young woman with de novo NF2.
• To identify defining features of a potential syndrome by analyzing similarities with prior literature cases.

Main Methods:

• Comprehensive case review including clinical assessment, neuroimaging, and genetic testing.
• Brain biopsy was performed for histopathological analysis.
• Multicase analysis was conducted to compare findings with existing literature.

Main Results:

• Brainstem ischemia in juvenile NF2 typically presents acutely in teenagers without prior diagnosis.
• Key features include midbrain/pons restricted diffusion, normal vascular imaging, and characteristic NF2 imaging.
• Biopsy reveals necrosis without small vessel pathology, followed by aggressive NF2 lesion progression.

Conclusions:

• Brainstem ischemia in juvenile NF2 constitutes a rare syndrome with an unclear etiology.
• An underlying, potentially unknown, vascular abnormality is suspected.
• A digenic effect contributing to the syndrome is not ruled out.