{
 "topic": "Intracranial Hemorrhage",
 "slug": "intracranial-hemorrhage",
 "category_id": 15438,
 "summary": "Intracranial hemorrhage across the pediatric age spectrum: neonatal germinal matrix/IVH and subarachnoid/cerebellar hemorrhage by gestational age, versus childhood hemorrhagic stroke from vascular anomalies, coagulopathy, and SCD.",
 "written_by": "claude-sonnet",
 "references": [
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 ],
 "short": [
  {
   "title": "In short",
   "content": "- Intracranial hemorrhage (ICH) is the most common acute CNS complication of preterm birth; types include subdural, epidural, subarachnoid, intracerebral/intraparenchymal, intracerebellar parenchymal, and germinal matrix/intraventricular hemorrhage (GMH/IVH).\n- In term infants, ICH tends to be extra-axial (subdural, subarachnoid, or subtentorial), most related to birth trauma, hypoxic-ischemic events, and coagulopathies (thrombophilias, thrombocytopenia).\n- In preterm infants, the most common ICH is bleeding from the subependymal germinal matrix, which can extend into the ventricles (IVH) or periventricular white matter, causing hemorrhagic infarction; risk of severe hemorrhage is inversely related to gestational age, with very low birthweight (under 1,500 g) infants at highest risk.\n- Primary subarachnoid hemorrhage is the most common type of neonatal ICH overall and the second most common intracranial hemorrhage in some classifications; it can be related to delivery trauma in term infants or occur alongside germinal matrix hemorrhage in preterm infants, and is often asymptomatic or presents with characteristic brief seizures with a normal interictal exam on day 2 - long-term outcome is uniformly good.\n- Intracerebellar parenchymal hemorrhage (ICPH) is increasingly recognized, more common in preterm infants; incidence by cranial ultrasound is about 9% in infants under 33 weeks' gestation (60% of these under 750 g), rising to about 37% when detected by susceptibility-weighted MRI; it uniquely causes unexplained motor agitation in addition to apnea and respiratory compromise.\n- In children beyond the newborn period, hemorrhagic stroke accounts for about 50% of childhood stroke, more often intraparenchymal than subarachnoid; the most common cause is a congenital vascular anomaly, with coagulopathy, hematologic disorders, and brain tumors as other frequent causes; children with sickle cell disease have increased risk of both ischemic and hemorrhagic stroke.\n- Sudden severe headache is the hallmark of a significant pediatric intracranial bleed, with vomiting, irritability, seizures, and altered sensorium as other features; diagnosis is made quickly by CT, with angiography reserved for identifying an underlying vascular abnormality in selected cases.\n- Cavernous malformations (cavernomas) are found incidentally in about 0.6% of children undergoing brain MRI (about 40-50% incidental, 20-25% presenting with seizures, 20-25% with a neurologic deficit from hemorrhage); annual hemorrhage risk is higher with prior hemorrhage, brainstem location, or an associated developmental venous anomaly.\n- Spontaneous intracranial hemorrhage in children with cancer is extremely rare except when the platelet count is under 5,000/uL; coagulopathy and thrombocytopenia should be specifically assessed and corrected in this population.\n"
  }
 ],
 "long": [
  {
   "title": "Definition",
   "content": "Intracranial hemorrhage (ICH) refers to bleeding within the intracranial compartment, classified by location: subdural, epidural, subarachnoid, intracerebral/intraparenchymal, intracerebellar parenchymal, and germinal matrix/intraventricular hemorrhage (GMH/IVH). In children beyond the newborn period, hemorrhagic stroke - encompassing intraparenchymal hemorrhage and nontraumatic subarachnoid hemorrhage - is a distinct clinical entity accounting for about half of all childhood stroke.\n"
  },
  {
   "title": "Epidemiology",
   "content": "ICH is the most common acute CNS complication of preterm birth. Very low birthweight infants (under 1,500 g) are at high risk, with the risk of severe hemorrhage inversely related to gestational age. Germinal matrix hemorrhage/intraventricular hemorrhage is the most common form of ICH in preterm infants and an important cause of long-term morbidity among NICU survivors. Intracerebellar parenchymal hemorrhage is increasingly detected and disproportionately affects premature infants; incidence by cranial ultrasound with an additional mastoid view is about 9% among infants under 33 weeks' gestation (60% of affected infants under 750 g), while brain MRI with susceptibility-weighted imaging detects it in about 37% of a similar population. Beyond the neonatal period, hemorrhagic stroke accounts for approximately 50% of childhood stroke, with intraparenchymal hemorrhage more common than subarachnoid hemorrhage.\n"
  },
  {
   "title": "Etiology",
   "content": "In preterm infants, ICH usually develops spontaneously, less often from trauma or asphyxia, and rarely from a primary hemorrhagic disturbance or congenital cerebrovascular anomaly; it often involves the ventricles (IVH) following spontaneous, atraumatic delivery. In utero hemorrhage associated with maternal idiopathic or (more often) fetal alloimmune thrombocytopenia can cause severe cerebral hemorrhage or a porencephalic cyst after a resolved fetal cortical hemorrhage. In term infants, ICH tends to be extra-axial (subdural, subarachnoid, or subtentorial), related to birth trauma, hypoxic-ischemic events, and coagulopathies such as thrombophilias or thrombocytopenia. Primary subarachnoid hemorrhage relates to delivery trauma in term infants or accompanies germinal matrix hemorrhage in preterm infants. Intracerebellar parenchymal hemorrhage has four possible mechanisms: primary hemorrhage into a cerebellar hemisphere or the vermis; venous infarction; reduced preterm cerebellar growth associated with supratentorial IVH and subarachnoid hemorrhage; and direct posterior fossa trauma with rupture of cerebellar bridging veins or occipital sinuses (seen primarily in term infants); traumatic delivery is a specific risk factor, and most lesions are unilateral, focal, and right-sided. In older children, the most common cause of hemorrhagic stroke is a congenital vascular anomaly, with coagulopathy, hematologic disorders, and brain tumors as other frequent causes; children with sickle cell disease have an increased risk of both ischemic and hemorrhagic stroke. Other recognized pediatric intracerebral hemorrhage etiologies include coagulopathy, thrombocytopenia, hypertension, malignancy, mycotic aneurysm, hemorrhagic encephalitis or meningitis, ischemic stroke with hemorrhagic transformation, and cerebral venous sinus thrombosis with hemorrhage. In children with cancer, spontaneous ICH is extremely rare except when the platelet count falls below 5,000/uL, and other contributing factors include hypertension, coagulopathy, thrombocytopenia, intracranial tumor, prior surgery, and radiation.\n"
  },
  {
   "title": "Clinical Features",
   "content": "Subarachnoid hemorrhage in a term neonate is usually asymptomatic but can present at 24-48 hours after birth with seizures, apnea, and other complications such as hyperbilirubinemia; the classic scenario is a well term infant with new-onset, characteristically brief seizures and a normal interictal exam (apnea is more common in premature infants with this diagnosis). Intracerebellar parenchymal hemorrhage uniquely causes unexplained motor agitation, in addition to the apnea, respiratory compromise, and breathing irregularities seen with ICH generally, and can present with a bulging fontanel and decreasing hematocrit. In older children, sudden severe headache is the hallmark of a significant intracranial bleed, with vomiting, irritability, seizures, and altered sensorium as accompanying features; small hemorrhages can produce only subtle signs and may go unrecognized. Posttraumatic intracerebral hematoma is unusual in children and usually results from severe focal or penetrating injury, typically causing severe neurologic compromise and a poor prognosis. Traumatic subarachnoid hemorrhage (including from shaking injury in infants) can cause headache, neck stiffness, and lethargy. Diffuse axonal injury, a common cause of prolonged posttraumatic coma in children, may show a normal initial CT or multiple petechial deep white matter hemorrhages, with MRI often more sensitive than CT for symptoms that seem disproportionate to CT findings.\n"
  },
  {
   "title": "Diagnostics",
   "content": "Acute hemorrhage is diagnosed quickly by CT of the brain; angiography is reserved for selected cases needing identification of an underlying vascular abnormality. Neonatal subarachnoid hemorrhage may be suspected on lumbar puncture and confirmed with CT or MRI. Cavernous malformations (cavernomas), found incidentally in about 0.6% of children undergoing brain MRI, present incidentally in 40-50% of cases, with seizures in 20-25% and a neurologic deficit from hemorrhage in another 20-25%; about 70% are solitary and 30% multiple (with multiplicity more likely in familial cases or after radiation therapy). The Zabramski MRI classification (types I-IV, reflecting hemorrhage age and appearance) helps predict annual hemorrhage risk, which is also elevated with prior hemorrhage, brainstem location, or an associated developmental venous anomaly (present in 25% of cavernomas).\n"
  },
  {
   "title": "Treatment",
   "content": "Management of pediatric hemorrhagic stroke and ICH depends on the underlying cause and is addressed alongside broader stroke and hematologic emergency management, with specific attention to correcting any coagulopathy or thrombocytopenia. Cavernous malformations with a high hemorrhage risk (recurrent hemorrhage, brainstem location, or lower Zabramski grade) are treated with total surgical excision, sparing any associated developmental venous anomaly.\n"
  },
  {
   "title": "Prognosis",
   "content": "Long-term follow-up after neonatal primary subarachnoid hemorrhage is uniformly good. In contrast, posttraumatic intracerebral hematoma in children, usually resulting from severe injury, often carries a poor prognosis, and severe germinal matrix/intraventricular hemorrhage is an important cause of long-term morbidity among NICU survivors.\n"
  }
 ],
 "clinical": [
  {
   "title": "Recognizing ICH by Age and Presentation",
   "content": "In a preterm infant, especially very low birthweight (under 1,500 g), maintain a high index of suspicion for germinal matrix/intraventricular hemorrhage, which is often spontaneous and can occur without apparent trauma; unexplained motor agitation together with apnea or breathing irregularity should raise concern for intracerebellar parenchymal hemorrhage specifically. In a well term neonate with new-onset, characteristically brief seizures and an otherwise normal interictal exam around day 2 of life, consider primary subarachnoid hemorrhage - reassure that long-term outcome is typically good once confirmed by CT or MRI (lumbar puncture can be suggestive). In an older child, treat sudden severe headache, especially with vomiting, irritability, seizures, or altered sensorium, as a possible significant intracranial bleed and obtain CT promptly; remember small hemorrhages can present subtly and be missed without a high index of suspicion. Consider hemorrhagic stroke in any child with sickle cell disease presenting with acute neurologic symptoms, since SCD raises risk of both ischemic and hemorrhagic stroke.\n"
  },
  {
   "title": "Directing the Etiologic Work-Up",
   "content": "Once hemorrhage is confirmed, tailor further work-up to age and clinical context: in neonates, consider birth trauma, hypoxic-ischemic injury, and coagulopathy/thrombocytopenia (including fetal/neonatal alloimmune thrombocytopenia) for extra-axial term hemorrhage, versus prematurity-related germinal matrix fragility for IVH. In older children, pursue vascular imaging (angiography in selected cases) to look for a congenital vascular anomaly, the most common cause of childhood hemorrhagic stroke, and check coagulation studies and platelet count, particularly in a child with cancer, where spontaneous ICH is essentially confined to those with platelets under 5,000/uL - correct any coagulopathy or severe thrombocytopenia urgently in this setting. When a cavernous malformation is found (often incidentally on MRI), use the Zabramski classification, hemorrhage history, and lesion location (brainstem carries higher risk) to guide referral for surgical excision versus observation.\n"
  }
 ]
}