Cerebellar Hematoma

Article Author:
Michelle Fischer

Article Editor:
Joe M Das

Editors In Chief:
Kranthi Sitammagari
Mayank Singhal

Managing Editors:
Avais Raja
Orawan Chaigasame
Carrie Smith
Abdul Waheed
Khalid Alsayouri
Trevor Nezwek
Radia Jamil
Patrick Le
Anoosh Zafar Gondal
Saad Nazir
William Gossman
Hassam Zulfiqar
Hussain Sajjad
Steve Bhimji
Muhammad Hashmi
John Shell
Matthew Varacallo
Heba Mahdy
Ahmad Malik
Sarosh Vaqar
Mark Pellegrini
James Hughes
Beata Beatty
Beenish Sohail
Nazia Sadiq
Hajira Basit
Phillip Hynes

8/19/2019 9:36:26 AM


Cerebellar hemorrhage or hematoma is a type of intracranial hemorrhage (ICH) where the bleeding is located in the posterior fossa or cerebellum and accounts for 9 to 10% of all ICH.[1] The posterior fossa is a small space in the skull containing the brainstem and cerebellum.  If a mass such as a hemorrhage grows in this region, particularly the brainstem and 4th ventricle, it can block the normal flow of cerebral spinal fluid leading to hydrocephalus, increased intracranial pressure, and symptoms onset.  Cerebellar hemorrhage can be spontaneous, a result of a stroke or secondary to trauma, and occurs most frequently in middle-aged and older adults.  Patients typically have underlying risk factors leading to the hemorrhage such as hypertension or small vessel disease.  The clinical presentation is dependent upon the size and location of hematoma as well as location and amount of edema of associated structures in the posterior fossa.  The initial imaging modality is typically a non-contrast computed tomography (CT) scan.  Management spans the spectrum from close observation to acute surgical intervention with optimal timing of surgery.


The most common non-traumatic etiology for cerebellar hemorrhage as for all intracranial hemorrhage is hypertensive vasculopathy causing microaneurysms and resultant rupture.  Cerebellar hemorrhage from hypertension most commonly occurs in the middle-aged or older population often in the dentate nucleus with extension to other areas from rupture of microaneurysms along the penetrating small vessels.  Other causes of cerebellar hemorrhage include trauma, coagulopathy (cirrhosis, disseminated intravascular coagulation or thrombocytopenia) or bleeding disorders (primary and drug-induced (anticoagulation, antiplatelet or thrombolytic medications)), ischemic stroke with hemorrhagic transformation, cerebral amyloid angiopathy,[2] vascular malformations such as arteriovenous malformation (AVM), dural arteriovenous fistula in the tentorium,[3] brain tumors (primary or metastatic),[4][5] septic embolism, central nervous system infection (encephalitis, moyamoya disease, vasculitis (lupus)), sympathomimetic drugs such as cocaine and amphetamines,[6] aneurysm (posterior circulation) or remote hemorrhage following supratentorial neurosurgical procedure.[7]

The most common primary CNS tumors to undergo hemorrhagic transformation are the glioblastomas.  The metastatic CNS tumors that are more prone to hemorrhage include lesions from the lung, breast, kidney, and melanomas.  Cerebellar hemorrhage in younger patients may be due to substance abuse, trauma, or CNS aneurysms or AVMs.


Nontraumatic intracranial hemorrhage varies by race and age, but overall it is the cause of 9 to 27% of strokes globally with an annual incidence of 12 to 31 per 100000 people.[8][9] Cerebellar hemorrhage occurs in approximately 10% of all ICH with a low annual incidence of 1 to 2% in all strokes.  The incidence of ICH increases with age, doubling every 10 years after age 35.[10][11] The rate is highest in the Asian populations, lowest in whites, with blacks having an intermediate occurrence rate.[12]


The cerebellar location is not unique as far as the causes of intracranial hemorrhage.  The prevailing belief is that patients with long-standing hypertension have degenerative changes in the penetrating small blood vessel walls leading to the subsequent formation of microaneurysms that rupture and hemorrhage.[13]  Tumors, blood disorders, amyloid, arteriovenous malformation, trauma, and stimulant drug abuse may also lead to cerebellar hemorrhage.  Remote cerebellar hemorrhage after craniotomies is thought to be a result of a loss of cerebral spinal fluid (CSF) causing a "sag" in the cerebellum with resultant venous bleeding often tracking along the superior cerebellum with most cases having a benign course.[14]

History and Physical

Symptom onset is typically abrupt with a significant variation of symptom presentation dependent on the location and size of the hemorrhage.   Some patients with smaller cerebellar hemorrhage remain awake and may complain of headache, nausea, vomiting, vertigo or ataxia.  If the hemorrhage is large, patients may present with an altered level of consciousness or even unresponsiveness. Symptoms may change suddenly correlating with hematoma expansion.  Symptoms may also occur during stressful situations or strenuous activity. A detailed history is critical, noting any of the following: a history of hypertension, coagulopathy including chemically induced, head trauma, known history of intracranial aneurysm or arteriovenous malformation (AVM), history of malignancy, and use of sympathomimetic drugs (cocaine and amphetamines).  Symptom presentation in descending order of frequency include the following:

  • Abrupt onset headache
  • Nausea and vomiting
  • Difficulty with ambulation (truncal ataxia)
  • Vertigo and dizziness
  • Dysarthria
  • Neck pain or nuchal rigidity
  • Loss of consciousness or altered mental status

Physical examination is also variable and dependent on hemorrhage location with some patients awake and others unresponsive.  Cerebellar signs may include any combination of the following:

  • Limb ataxia
  • Dysarthria
  • Nystagmus
  • Abnormal gaze or facial weakness (cranial nerve palsy ipsilateral to the hematoma)
  • Abnormal gait


Noncontrast head tomography (CT) imaging is quick and widely available so is typically the first and most efficient method of evaluation for those patients who present with signs and symptoms of possible cerebellar hemorrhage.  Most hemorrhages are readily identified as hyperdense lesions in the cerebellum.  On occasion, dense calcification of the dentate nucleus can be confused with hemorrhage, but the absence of a mass effect, sharp margins, and bilateral presence should point more towards calcification over a hemorrhage.  Contrast extravasation following an endovascular procedure will also appear dense like a cerebellar hemorrhage, but dual-energy CT can differentiate the two.[15]  Further imaging modalities that may help in the further delineation of the lesion may be CT angiogram, magnetic resonance imaging (MRI), magnetic resonance angiography (MRA) or angiography.    

Treatment / Management

Treatment of cerebellar hemorrhage is dependent on the size of the hemorrhage in addition to the clinical presentation.  Airway protection with endotracheal intubation may be necessary for patients who present with severely altered and depressed level of consciousness or altered mental status (GCS less than 8).  Neurosurgical consultation should be obtained urgently after diagnosis to assist with optimal management and treatment. Small hemorrhages without significant mass effect can often be managed conservatively with admission to a critical care unit capable of frequent neurologic assessments.  Large hemorrhages, typically greater than 3 to 4 cm, may require surgical intervention and evacuation particularly if associated with edema, intraventricular extension, brainstem displacement or hydrocephalus.  If patients are intubated, normocarbia should be maintained.  There is no need for prophylactic hyperventilation except in the extreme cases of impending brainstem herniation, and it should only be for a short period.[16]  Corticosteroids have not demonstrated any benefit in the treatment of cerebellar hemorrhage. 

Patients with cerebellar hemorrhage often have an acute blood pressure elevation as in any other case of intracranial hemorrhage.  It is often a fine balance to aim to minimize hemorrhage growth and increased intracranial pressure while maintaining cerebral perfusion.  A recent consensus recommendation believes it is safe to lower the blood pressure to less than 140 mm Hg systolic.[17][18] The 2010 American Heart Association guidelines on the management of blood pressure in intracerebral hemorrhage suggest values less than 160/90 mm Hg or a mean arterial pressure (MAP) less than 110 mm Hg.[19] Body temperature should be maintained within the normal range and if the patient does develop an elevated body temperature, pharmacotherapy or cooling measures should be instituted to maintain a core body temperature of lower than 37.5 C as fever has been shown to worsen outcomes in the injured brain.[20]  Current evidence does not support hypothermia for cerebellar hemorrhage.  Maintaining normal glucose levels is necessary as hyperglycemia has correlations with poorer outcomes in patients with cerebellar hemorrhage.[21][22]  Hypoglycemia should also be avoided, and current practice suggests a reasonable glucose range of 100 to 180 mg/dL.[23] In the intensive care setting insulin therapy over oral agents is preferred.  Intensive compared to conventional glucose control did not demonstrate any significant difference in clinical outcome.[24][25] Normovolemia should be maintained with isotonic fluids with appropriate correction of serum electrolytes such as sodium, potassium, and magnesium.  Mild hypertonic fluid such as 1.5% hypertonic saline may be used to correct hyponatremia. Cardiac arrhythmias may occur with an injured brain, and it is important to keep the potassium level above 4.0 mmol/L and magnesium above 2.0 mg/dL so as not to aggravate arrhythmias. 

Anticoagulation and/or antiplatelet medications should be immediately discontinued in cases of cerebellar hemorrhage.  Reversal of the coagulopathy should take place with an appropriate reversal agent.  Patients on warfarin should receive vitamin K (10 mg) and factor replacement in the form of fresh frozen plasma (FFP) or prothrombin complex concentrate (PCC), both of which are effective.[26] Factor replacement with PCC or 4-factor-PCC should be attempted in patients on novel oral anticoagulants, but supporting evidence is limited.[27][28]  Platelet replacement therapy in patients on antiplatelet medications or those with thrombocytopenia and platelet counts less than 50000 is often performed with severe bleeding and before surgical intervention, but the benefit is unknown.  

Differential Diagnosis

The differential diagnosis for patients presenting with any combination of sudden onset of symptoms such as headache, nausea, vomiting, dizziness or vertigo includes both central and peripheral disease processes. Primary causes include cerebellar hemorrhage, cerebellar infarction, or an acute demyelinating disorder such as multiple sclerosis (MS) or encephalitis, cerebellitis, alcohol, illicit drugs, medication toxicity (phenytoin or carbamazepine) or cerebellar neoplasm.  Perpherial causes include benign paroxysmal positional vertigo (BPPV), labyrinthitis, vestibular neuronitis or Meniere disease. 


The mortality associated with cerebellar hemorrhage can range from 25% to 57%.[29][30]   Outcomes following surgery are strongly correlated with the patient's clinical status before surgery but is favorable in over half of the cases.[29][31]  Recommendations are therefore that in the absence of multiple comorbidities surgical intervention should be pursued even in patients with poor preoperative neurologic status.


Significant cerebellar hemorrhage may have peri-hemorrhagic edema and mass effect, which, unfortunately, can cause multiple complications including brainstem compression, cerebellar herniation, compression of the fourth ventricle with resultant obstructive hydrocephalus, an extension of hemorrhage into the ventricular system and recurrent hemorrhage typically within the first 24 hours.  There are two options for managing the mass effect from the cerebellar hemorrhage: (1) hyperosmolar agents or (2) decompressive surgery.

Osmolar therapy is used to reduce the space-occupying effects of hemorrhage and edema by increasing serum osmolality and facilitating an osmotic movement of water into the vasculature with resultant reactive vasoconstriction.  The goal is an overall reduction in intracranial pressure and tissue shrinkage.  There is no superiority of hypertonic saline over mannitol or vice versa for the treatment of intracranial hemorrhage.  Hypertonic saline concentrations typically utilized for treatment are 3% (250 mL bolus), 10% (75 to 150 mL bolus), and 23.4% (30 mL bolus).  Boluses and continuous infusions have the goal of sodium levels of 145 to 155 mmol/L and osmolality of 310 to 320 mOsm/kg.[32]  Complications may occur with infusions such as hypotension, pulmonary edema, heart failure, coagulopathy, hypokalemia, intravascular hemolysis, and encephalopathy but these are rare.[33]  Mannitol is a sugar alcohol that acts as a diuretic and is usually administered as a 1 to 2 g/kg bolus (20% concentration) with additional doses of 0.5 g/kg every 4 to 6 hours.[34][35]  It is imperative to maintain euvolemia during its administration and caution is advised in patients with renal failure as the mannitol may lead to fluid overload necessitating dialysis shortly after administration.  Serum osmolality should remain at less than 320 mOsm/kg to prevent renal toxicity.

Decompressive surgery of choice is suboccipital craniectomy with hematoma evacuation.[36][37]  The surgical option is necessary when the patient's neurologic status continues to decline due to brainstem compression or obstructive hydrocephalus, and it appears secondary to the mass effect of the hemorrhage and peri-hemorrhagic edema.  An external ventricular drain (EVD) may be used to treat the obstructive hydrocephalus as an alternative to surgery or in addition to surgery.  Criteria used to select patients for surgery and/or EVD placement have their basis on both clinical presentation and radiographic features such as the size of hematoma, ventricular extension, hydrocephalus, brainstem compression, and cisternal effacement.[38][39]  Hemorrhages less than 3 cm in diameter without evidence of brainstem compression or hydrocephalus may be treated with close observation in an intensive care setting without surgery.  A stereotactic burr-hole aspiration is an option for patients with smaller hemorrhages.[40]

Deterrence and Patient Education

Most cerebellar hemorrhages are hypertensive in origin.  Patients suffering from hypertension should receive education so that they are aware of all the potential risks and complications associated with poor control of their disease process so that they may seek medical attention urgently if they develop worrisome symptoms. 

Enhancing Healthcare Team Outcomes

The diagnosis and management of a cerebellar hemorrhage are with an interdisciplinary team that includes a combination of the following: emergency physician, neurosurgeon, neurologist, primary care provider, intensivist and acute practice provider. The nurses who usually monitor these patients have specialty training in neuroscience and know what signs and symptoms to watch for progression of the disorder. They must discuss abnormal findings with the clinicians as quickly as possible. The interprofessional team also includes providers and pharmacists, which is considered the best approach to the management of these cases for optimal care and outcomes. The presentation of cerebellar hemorrhage may be subtle to a patient in extremis and is often not easy, requiring intensive management and treatment. The majority of patients are managed in a critical care setting with frequent neurologic assessments, blood pressure control, electrolyte, and intravenous fluid management, and supportive care.  Management requires treatment with multiple pharmacologic agents. The pharmacist should manage medication reconciliation and consider potential drug interactions reporting to the team concerning drug interactions. [Level V]

The outcome depends on the severity of the bleeding, presence of neurological deficit, age of the patient and other associated co-morbidity. An interprofessional team approach to the evaluation and education of the patient and family will lead to the best outcomes.

  • Image 9852 Not availableImage 9852 Not available
    Image courtesy S Bhimji MD
Attributed To: Image courtesy S Bhimji MD

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Cerebellar Hematoma - Questions

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A patient was admitted to the intensive care unit 12 hours ago with cerebellar hemorrhage. The patient is now unresponsive with extremely elevated blood pressure, slow heart rate, and irregular respirations. It is decided that the patient has a complication from his cerebellar hemorrhage. The operating room is not currently available for decompressive surgery, so it is decided to initiate therapy to decrease the intracranial pressure. Which of the following would be the most appropriate intervention?

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A middle-aged patient with a history of atrial fibrillation and hypertension currently on coumadin complains of a sudden onset of severe headache and neck pain. The patient is unable to ambulate secondary to severe ataxia, nausea, and vertigo. A CT scan of the head is obtained that demonstrates a 1.5 cm right cerebellar hemorrhage. What is the most likely etiology for the patient’s CT findings?

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A 65-year-old male with a history of long-standing hypertension, diabetes mellitus, and chronic obstructive pulmonary disease presents to the emergency department for evaluation complaining of a severe headache and the sensation that the room is spinning. He denies similar symptoms in the past or illicit drug use. He states that he has been compliant with his medications, but his blood pressure has always been difficult to control. His vital signs are blood pressure 185/108 mmHg, a pulse of 65 bpm, respiratory rate of 14/minute, afebrile, and oxygen saturation of 100% on room air. During the examination of the patient, he starts to vomit. Which of the following examination features would be concerning for a cerebellar disease process?

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A middle-aged patient with a history of hypertension is brought in by ambulance to the emergency department unresponsive with no arm or leg movement. The blood pressure is markedly elevated, the pulse is slow, and the respiration’s are irregular. The paramedics state that they had a 911 call early in the night for the same patient who had complained of a headache and dizziness, but he changed his mind about coming to the hospital. They were dispatched back to his home 3 hours later when the spouse found the patient unresponsive. Which imaging modality will most likely give the etiology for the patient’s current state?

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A 72-year-old female with a history of hypertension, hyponatremia, and atrial fibrillation on warfarin is brought to the emergency department by her daughter for evaluation of dizziness, nausea, and headache that has seemed to worsen since a fall she sustained 3 days ago tripping over her dog while outside on her concrete patio. Her blood pressure is 180/100 mmHg, and the pulse is 65 beats per minute. Physical examination reveals normal strength in upper and lower extremities, significant ataxia when standing, slightly dry mucous membranes, and no external evidence of head trauma. Which of the following is the most appropriate next step in her management?

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Cerebellar Hematoma - References


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