Convexity subarachnoid hemorrhage: reversible cerebral vasoconstriction syndrome

There is high attenuation material within the left precentral sulcus in keeping with a small volume of acute subarachnoid hemorrhage.

No remote intra- or extra-axial acute hemorrhages. No intracranial mass lesions. No acute or established cortical infarcts currently evident.

MRI brain

Small areas of abnormal T2/FLAIR signal are seen at the grey-white matter junction involving the right occipital lobe and both parietal lobes. These are bright on DWI but are not not unequivocally low on ADC.

High sulcal FLAIR signal in the left precentral gyrus correlates to be high density on CT, and is in keeping with acute subarachnoid blood.

No abnormal enhancement on the postcontrast images. No definite abnormality on suboptimal MRA-patient motion-subtle areas of narrowing in M2 and M3 left MCA branches. No MRI findings suspicious for posterior circulation dissection. The dural venous sinuses are patent on MRV.

Conclusion:

There is only subtle MRA abnormality, but the parenchymal findings and convexity subarachnoid blood would be in keeping with RCVS if in the appropriate clinical and lab context. PRES or vasculitis can also have this appearance. Further evaluation with DSA would be helpful. No evidence of cerebral venous sinus thrombosis or cerebral aneurysm.

Study limited due to poor cooperation and shortness of breath.

Patchy irregularity noted involving the PCA branches bilaterally.

Irregularity also noted along the ACA 3rd and 4t degree branches on the left side.

No convincing evidence of an aneurysm identified. The remainder of the study given the limitations was unremarkable.

Conclusion:

Consistent with RCVS. Close follow up and correlation with laboratory findings important to exclude vasculitis, or SAH secondary to other occult pathologies