BAP1 and Rhabdoid Meningioma: In cases of aggressive meningiomas displaying rhabdoid histomorphology, namely rhabdoid cells and a high proliferation index, the inactivation of the tumor suppressor gene (BAP1), which encodes for the breast cancer (BRCA)1-associated protein and can be a somatic loss or a germline mutation, has been linked to poorer prognosis in rhabdoid meningiomas with a reduced time to recurrence.