Fenestrated Falx Cerebri and Additional Sinuses in the Tentorium Cerebelli.

Morphological variations of falx cerebri and tentorium cerebelli are extremely rare. The authors report an extremely rare type of combined variation of falx cerebri and dural venous sinuses in the tentorium cerebelli. During the removal of the brain from cranial cavity, it was noted that the anterior part of the falx cerebri had fenestrations and it looked like a mesh. There was no associated variations of medial surface of cerebrum. Further, there were unusual sinuses within the tentorium cerebelli. Two of them were present in the right half of the tentorium cerebelli and one in the left half of the tentorium cerebelli. There variations could be of importance to radiologists and neurosurgeons. The fenestrations of falx cerebri might lead to misinterpretations in cases of head injuries and the additional sinuses in the tentorium cerebelli might cause unexpected bleeding during surgeries of posterior cranial fossa.