To question whether it is true to discuss the diagnoses according to only the pathological results. The patient is a 48 year-old man who presented with the complaints of headache, difficulty with balance and diplopia at September 24, 2001. A neurological examiation revealed only horizontal nystagmus and unsteady gait. A cranial magnetic resonance imaging (MRI ) study showed a well-defined cystic mass lesion in the right cerebellar hemisphere which had an enhancing mural nodule after intravenous contrast injection. The patient underwent a right suboccipital craniectomy and the mass was resected. In the first pathology report astrocytic tumor cells were told to have been found and in the second report the mass was told to be a pilocytic astrocytoma. The patient was discharged at October 3, 2001 and his neurological examination was the same as the pre-operative examination. During follow up he complained of headache that occurred from time to time and a cranial MRI study was done. It showed a right cerebellar cystic mass lesion with the same radiological characteristics as the first one. He was rehospitalized at Januar), 14, 2003. His neurological examination disclosed only horizontal nystagmus. The patient was reoperated. The specimen was examined together with the first one and the pathology report revealed the mass to be a hemangioblastoma. The patient was discharged at Januar), 24, 2003 . With this case report we want to emphasize the importance of close collaboration between clinicians, radiologists and pathologists.