CDKN2A and meningioma: As in our previous series, because of adCre diffusion through the CSF circulation, spinal meningiomas (n = 3) were found in adCre;Nf2flox2/flox2;Ink4a*/* mice and spinal MRI was performed in two mice presenting with paraparesis, a neurological signs suggestive of spinal cord compression (Figure 5A,C).