Background: Collision tumor is a very rare case of cerebral lesion. Approximately 50 reports of intracranial collision tumors were described in the literature. We present a case of supratentorial dural-based convexity collision tumor radiologically mimicking cavous malformation and composed of cavous malformation and meningioma. Case presentation: The case presents a 63-year-old female having MR findings such as hemorraged supratentorial dural-based mass with popc signs and hemosiderin deposits. The patient underwent craniotomy and evacuation of the subdural hematoma with resection of the tumor mass. Histologically the lesion had signs of a cavoma and meningioma. MRI in a year after surgery did not reveale residual tumor mass or recurrence. Conclusions: Collision tumor is a very rare case. Preoperative diagnosis of a dural lesion is difficult and challenging. A neuroradiological differential diagnosis of similar cases needs focused attention.