Chiasmal syndrome due to metastasis

Area of Science:

• Neuro-oncology
• Ophthalmology
• Endocrinology

Background:

• Chiasmal syndrome, a visual field defect, can arise from various causes.
• Metastasis to the optic chiasm is a rare but significant etiology.
• Understanding the clinical presentation and management is vital for patient outcomes.

Observation:

• Three patients with metastatic chiasmal syndrome were identified, with two additional cases from literature review.
• The characteristic presentation included progressive vision impairment, often without headache or abnormal skull X-rays.
• Associated symptoms included weight loss or diabetes insipidus in affected patients.

Findings:

• In three of the five cases, the primary malignancy was occult at the time of chiasmal dysfunction diagnosis.
• The optic chiasm can be affected by suprasellar pituitary metastasis, infundibular/hypothalamic infiltration, or hematogenous spread.
• Four out of five patients demonstrated a positive response to radiation therapy.

Implications:

• Metastatic chiasmal syndrome requires a high index of suspicion, especially in patients with unexplained vision loss and systemic symptoms.
• Prompt diagnosis and treatment, particularly irradiation, can lead to favorable visual recovery.
• Further research into the mechanisms and optimal management of metastatic chiasmal syndrome is warranted.