Collision Tumors: A Rare Case Report.

Area of Science:

• Neuro-oncology
• Neurosurgery
• Pathology

Background:

• Collision tumors, defined as two distinct primary tumors occurring simultaneously, are exceptionally rare in the brain.
• The co-occurrence of a meningioma and a colloid cyst without predisposing factors like phacomatoses, genetic syndromes, or prior radiation is exceedingly uncommon.

Observation:

• This report details an extremely rare case of a patient presenting with two independent primary brain tumors: a tentorial meningioma and a colloid cyst.
• The patient had no history suggestive of genetic syndromes, phacomatoses, or previous cranial radiation therapy.

Findings:

• The simultaneous presence of a meningioma and a colloid cyst in the same patient, absent any known risk factors, represents a unique clinical scenario.
• This case contributes to the limited existing literature, with only one prior report of a similar combination.

Implications:

• The findings underscore the importance of considering rare tumor presentations in differential diagnoses.
• This case addresses the critical surgical dilemma of prioritizing intervention when faced with multiple distinct intracranial pathologies.
• Further investigation into the potential underlying mechanisms for such rare tumor collisions may be warranted.