Remote cerebellar hemorrhage

Remote cerebellar hemorrhages are a relatively benign, but extremely rare, complication of supratentorial craniotomy or spinal surgery ^1,2.  It is called 'remote' as the cerebellar hemorrhage is far from the location of the surgery. 

Epidemiology

 A rare complication seen in 0.04% to 0.8% post craniotomy and post spinal surgeries possibly due to break in dura ⁸.

Clinical presentation

Most patients are asymptomatic ². When symptomatic, delayed awakening from anesthesia and reduced level of consciousness are the frequently reported symptoms, although cerebellar signs such as ataxia can also be present ¹. It often tends to have a self-limiting course ¹. 

Pathology 

It has been postulated that post-surgical CSF hypovolemia causes cerebellar sagging and occlusion of superior penetrating veins and hence hemorrhagic infarction ¹. The exact pathophysiology, however, is not clear.

Radiographic features

CT

The most common radiologic finding is layering of blood over superior folia, called the zebra sign ^6,7, and less frequently it can be an intraparenchymal or lobar hemorrhage. Cerebellar hemorrhage can be contralateral or ipsilateral to the site of surgery, and less commonly can be bilateral or even can be isolated to the vermis. The right clinical context is invaluable for image interpretation.

Treatment and prognosis

Generally, no specific management is required ¹. However, if the hemorrhage is large enough to cause obstructive hydrocephalus, then further neurosurgical intervention is required ¹. It has poor prognosis ⁸.

Differential diagnosis

• hemorrhagic cerebellar metastasis
• traumatic cerebellar hemorrhage
• hemorrhagic cerebellar tumor