"Miliary" metastatic tumors in the brain. Case report

Area of Science:

• Neurology
• Oncology
• Radiology

Background:

• Metastatic brain tumors are secondary malignancies that spread to the brain from a primary cancer elsewhere in the body.
• Miliary metastases are characterized by numerous small lesions, resembling millet seeds.
• The occurrence of miliary metastases in the brain without a known primary tumor is exceptionally rare.

Observation:

• A 69-year-old male patient presented with an unusual presentation of brain tumors.
• Imaging revealed innumerable metastatic lesions distributed throughout both cerebral and cerebellar hemispheres, basal ganglia, and brainstem.
• Notably, there was no associated cerebral edema, mass effect, or parenchymal reaction to the lesions.
• No calcification was observed within any of the brain lesions.

Findings:

• The case describes a unique instance of miliary metastatic disease extensively involving the brain.
• The absence of a detectable primary tumor at the time of diagnosis presents a diagnostic challenge.
• The widespread dissemination of small lesions across multiple brain regions is a key characteristic.

Implications:

• This case highlights the importance of considering rare metastatic patterns in neuro-oncology.
• Further investigation may be needed to understand the specific oncogenic pathways driving such diffuse brain seeding.
• Such unusual presentations can inform diagnostic strategies and potentially influence treatment approaches for patients with unexplained neurological symptoms.