Abstract: Intracranial collision tumors are rare in clinic. Preoperative diagnosis is difficult. Diagnosis is mainly based on postoperative pathological results. Two cases of intracranial collision tumors located in cerebellum and sellar region were treated by posterior median approach and pterional approach respectively. The cerebellar collision tumor was completely resected, and the pathological result was the collision of metastatic tumor and meningioma. The patient died of multiple metastatic multiple organ failure 14 months after operation. The sellar region tumor was subtotal resected. The pathological result was a collision of meningioma and pituitary adenoma. Symptoms of upper eyelid lifting were alleviated, and no recurrence was found after 1 year follow-up.

Key words: neoplasm metastasis, meningioma, adenoma, pathology, collision tumor, pituitary adenoma