[Bridging vein injuries in shaken baby syndrome : Forensic-radiological meta-analysis with special focus on the tadpole sign]

Shaken baby syndrome is a common variant of the abusive head trauma in infants and toddlers and is still subject of intensive research. In recent years, a number of radiological studies on the diagnostic and forensic relevance of injured bridging veins were conducted using different imaging modalities. The present article will give an overview on the current state of research in this field and will discuss the forensic implications. The meta-analysis of the seven currently existing studies revealed that injuries of the bridging veins and bridging vein thromboses, respectively, frequently appear as rounded, enlarged, and/or tubular structures. The "tadpole sign" may serve as a valuable tool for the identification of these formations. Especially, T2*/SWI (susceptibility-weighted imaging) sequences allow for good detectability of these lesions and should always be generated when abusive head trauma is suspected. In conclusion, it can be recommended that the presence of radiologically detectable bridging vein injuries should give reason to search for other manifestations of physical child abuse.

[Shaken baby syndrome]

The shaken baby syndrome (SBS) or shaking trauma describes the occurrence of subdural hematoma, retinal hemorrhage and diffuse injury to the brain by vigorous shaking of an infant that has a poor prognosis. Rapid cranial acceleration and deceleration leads to tearing of bridging veins, retinal hemorrhages and diffuse brain injuries. In addition to clinical symptoms, such as irritability, feeding difficulties, somnolence, apathy, seizures, apnea and temperature regulation disorders, vomiting also occurs due to increased intracranial pressure. Milder forms of SBS often go undiagnosed and the number of unreported cases (grey area) is probably much higher. Up to 20 % of patients die within days or weeks due to SBS and survivors often show cognitive deficits and clinical symptoms, such as physical disabilities, impaired hearing, impaired vision up to blindness, epilepsy and mental retardation as well as a combination of these conditions; therefore, prevention is very important.

[Refractory status epilepticus presenting as shaken baby syndrome]

INTRODUCTION

A convulsive status in infants is usually triggered by a febrile syndrome secondary to an intercurrent infection or an infection affecting the central nervous system. Shaken baby syndrome is characterised by its association with bilateral or multifocal haemorrhage, retinal haemorrhage and encephalopathy. Children under one year old are the group with the highest risk, with a maximum incidence reaching a peak between 10 and 16 weeks of age. Intercurrent processes, such as baby colic or febrile syndromes that tend to step up crying, are usually precipitating factors of shaking.

CASE REPORTS

We present the cases of two infants who began with a status epilepticus within a context of a febrile syndrome. Imaging tests revealed bilateral subdural haematomas in different stage of progress and bilateral retinal haemorrhages were observed in the fundus oculi of both children.

CONCLUSIONS

In a child with an unspecific febrile process that develops a convulsive status, the professional should suspect, in addition to more usual problems, shaken baby syndrome as a possible causation, above all if the child is under six months old.

The "Shaken Baby" syndrome: pathology and mechanisms

The "Shaken Baby" syndrome (SBS) is the subject of intense controversy; the diagnosis has in the past depended on the triad of subdural haemorrhage (SDH), retinal haemorrhage and encephalopathy. While there is no doubt that infants do suffer abusive injury at the hands of their carers and that impact can cause catastrophic intracranial damage, research has repeatedly undermined the hypothesis that shaking per se can cause this triad. The term non-accidental head injury has therefore been widely adopted. This review will focus on the pathology and mechanisms of the three physiologically associated findings which constitute the "triad" and are seen in infants suffering from a wide range of non-traumatic as well as traumatic conditions. "Sub" dural bleeding in fact originates within the deep layers of the dura. The potential sources of SDH include: the bridging veins, small vessels within the dura itself, a granulating haemorrhagic membrane and ruptured intracranial aneurysm. Most neuropathologists do not routinely examine eyes, but the significance of this second arm of the triad in the diagnosis of Shaken Baby syndrome is such that it merits consideration in the context of this review. While retinal haemorrhage can be seen clinically, dural and subarachnoid optic nerve sheath haemorrhage is usually seen exclusively by the pathologist and only rarely described by the neuroradiologist. The term encephalopathy is used loosely in the context of SBS. It may encompass anything from vomiting, irritability, feeding difficulties or floppiness to seizures, apnoea and fulminant brain swelling. The spectrum of brain pathology associated with retinal and subdural bleeding from a variety of causes is described. The most important cerebral pathology is swelling and hypoxic-ischaemic injury. Mechanical shearing injury is rare and contusions, the hallmark of adult traumatic brain damage, are vanishingly rare in infants under 1 year of age. Clefts and haemorrhages in the immediate subcortical white matter have been assumed to be due to trauma but factors specific to this age group offer other explanations. Finally, examples of the most common causes of the triad encountered in clinical diagnostic and forensic practice are briefly annotated.

Predictive value of clinical and radiological findings in inflicted traumatic brain injury

AIMS

The aim of this study is to evaluate the value of early radiological investigations in predicting the long-term neurodevelopmental outcome of infants with inflicted traumatic brain injury (ITBI).

METHODS

Clinical and radiological investigations of 24 infants with ITBI were performed during the acute phase of injury (1-3 days), and during the early (4 days up to 3 months) and late (>9 months) postinjury phases. The clinical outcome in survivors (n = 22) was based on the Rankin Disability Scale and the Glasgow Outcome Score.

RESULTS

Five out of 24 infants (21%) had a poor neurodevelopmental outcome (death and severe disability), 17 infants (71%) had different developmental problems and 2 infants were normal at the mean age of 62 (54-70) (95% CI) months. A low initial Glasgow Coma Scale score of 8 or below [p < 0.05, OR 13.0 (1.3-133.3)], the development of brain oedema [p < 0.005, OR 13.0 (1.6-773)], focal changes in the basal ganglia during the acute phase [p < 0.01, OR 45 (2.1-937.3)], the development of new intracerebral focal changes early postinjury [p < 0.05, OR 24.1(1.0-559.1)], a decrease in white matter [p < 0.01, OR 33 (1.37-793.4)] and the development of severe atrophy before 3 months postinjury [p < 0.05, OR 24 (11.0-559.1)] were significantly correlated with a poor neurodevelopmental outcome.

CONCLUSIONS

Early clinical and radiological findings in ITBI are of prognostic value for neurodevelopmental outcome.

Shaken Baby Syndrome

Unfortunately, head trauma caused by shaken baby syndrome is a common occurrence in infants and young children. The proper treatment and safety of these children can be enhanced by the nurse's ability to recognize features characteristic of this syndrome. If abuse is suspected, appropriate physicians, child-protective, and law-enforcement agencies should be notified immediately. Further research must be done to improve the understanding of the mechanisms associated with this disorder in the ultimate hope of improving the lives and outcome of infants and children.

Comparison of accidental and nonaccidental traumatic head injury in children on noncontrast computed tomography

OBJECTIVE

Mixed-density convexity subdural hematoma and interhemispheric subdural hematoma suggest nonaccidental head injury. The purpose of this retrospective observational study is to investigate subdural hematoma on noncontrast computed tomography in infants with nonaccidental head injury and to compare these findings in infants with accidental head trauma for whom the date of injury was known.

PATIENTS AND METHODS

Two blinded, independent observers retrospectively reviewed computed tomography scans with subdural hematoma performed on the day of presentation on 9 infant victims of nonaccidental head injury (mean age: 6.8 months; range: 1-25 months) and on 38 infants (mean age: 4.8 months; range: newborn to 34 months) with accidental head trauma (birth-related: 19; short fall: 17; motor vehicle accident: 2).

RESULTS

Homogeneous hyperdense subdural hematoma was significantly more common in children with accidental head trauma (28 of 38 [74%]; nonaccidental head trauma: 3 of 9 [33%]), whereas mixed-density subdural hematoma was significantly more common in cases of nonaccidental head injury (6 of 9 [67%]; accidental head trauma: 7 of 38 [18%]). Twenty-two (79%) subdural hematomas were homogeneously hyperdense on noncontrast computed tomography performed within two days of accidental head trauma, one (4%) was homogeneous and isodense compared to brain tissue, one (4%) was homogeneous and hypodense, and four (14%) were mixed-density. There was no statistically significant difference in the proportion of interhemispheric subdural hematoma, epidural hematoma, calvarial fracture, brain contusion, or subarachnoid hemorrhage.

CONCLUSIONS

Homogeneous hyperdense subdural hematoma is more frequent in cases of accidental head trauma; mixed-density subdural hematoma is more frequent in cases of nonaccidental head injury but may be observed within 48 hours of accidental head trauma. Interhemispheric subdural hematoma is not specific for inflicted head injury.

Inflicted traumatic brain injury (ITBI) or shaken baby syndrome (SBS) in Estonia

BACKGROUND

Inflicted traumatic brain injury (ITBI) or shaken baby syndrome (SBS) is recognized as a major cause of disability and death in the paediatric population.

AIM

To find out the incidence of ITBI in Estonia.

METHODS

26 cases of ITBI were recognized: four children died, 22 survived.

RESULTS

Of 26 children, 20 (77%) were boys and six (23%) were girls. Median age at admission to hospital was 3.9 mo, and the boys were younger than the girls.

CONCLUSION

The overall incidence of ITBI was 28.7 per 100,000 infants. In the prospective group the incidence was 40.5 per 100,000, and in retrospective group 13.5 per 100,000. ITBI is not rare but not always a recognized form of child abuse. Healthcare professionals should be more aware of this condition.

[Typical findings of maltreated children]

Childhood maltreatment manifests in a variety of forms and the underlying causes are manifold. In contrast to other offences involving physical injury, reporting behavior has, statistically speaking, remained unchanged. Patterns of injury must first be established and documented, and this involves a complete examination of the child's body. Depending on the constellation of findings, a radiological diagnosis is usually necessary. When all the findings have been collected, the further steps to be taken--where indicated a report to the police--must be discussed. All the evidence must be recorded, and photos obtained of all externally visible injuries before they fade. It is not the task of the physician to develop criminalistic ambitions, for example, by grilling (a parent) on the cause of the injuries. However, he/she has a duty to do everything necessary to protect the well-being of the child.

Representation of cerebral bridging veins in infants by postmortem computed tomography

The postmortem diagnosis of shaken baby syndrome, a severe form of child abuse, may be difficult, especially when no other visible signs of significant trauma are obvious. An important finding in shaken baby syndrome is subdural haemorrhage, typically originating from ruptured cerebral bridging veins. Since these are difficult to detect at autopsy, we have developed a special postmortem computed tomographic (PMCT) method to demonstrate the intracranial vein system in infants. This method is minimally invasive and can be carried out conveniently and quickly on clinical computed tomography (CT) systems. Firstly, a precontrast CT is made of the infant's head, to document the original state. Secondly, contrast fluid is injected manually via fontanel puncture into the superior sagittal sinus, followed by a repeat CT scan. This allows the depiction of even very small vessels of the deep and superficial cerebral veins, especially the bridging veins, without damaging them. Ruptures appear as extravasation of contrast medium, which helps to locate them at autopsy and examine them histologically, whenever necessary.

Shaken baby syndrome without intracranial hemorrhage on initial computed tomography

OBJECTIVE

We sought to describe the unique characteristics of children diagnosed with shaken baby syndrome (SBS) despite the absence of intracranial hemorrhage on cranial computerized tomography (CT) on hospital admission.

METHODS

Using an international e-mail-based listserv for professionals with an interest in child abuse, we identified and reviewed the charts of children hospitalized in different medical centers who were diagnosed with SBS although CT disclosed no signs of intracranial bleeding. Children with normal imaging were not included.

RESULTS

Eight cases were identified. All children had cerebral edema in CT, which was severe on 7/8 cases (88%). All of these children had extensive retinal hemorrhage. The prognosis was poor; 5/8 infants died (63% mortality), and the rest had permanent neurologic damage.

CONCLUSION

The diagnosis of SBS can be established even when CT at presentation does not demonstrate intracranial hemorrhage. We hypothesize that rapidly developing cerebral edema may cause increased intracranial pressure and tamponade that prevents the accumulation of intracranial blood. The prognosis in these cases is grave.

Shaken Baby Syndrome Manifesting as Chronic Subdural Hematoma: Importance of Single Photon Emission Computed Tomography for Treatment Indications-Case Report-

A boy with shaken baby syndrome first presented at age 3 months with acute subdural hematoma (SDH) and was treated by subdural tapping at a local hospital. Chronic SDH was identified at a rehabilitation center at age 19 months. The chronic SDH appeared to have developed within the preceding 16 months. His physical and mental development was already delayed. Magnetic resonance (MR) imaging revealed a 20-mm thick right chronic SDH with midline shift and small bilateral subdural effusions. The chronic SDH had compressed the right cerebral hemisphere. MR imaging also disclosed bilateral cerebral atrophy. 99mTc-ethylcysteinate dimer single photon emission computed tomography (SPECT) revealed decreased cerebral blood flow (CBF) in the non-hematoma hemisphere, although CBF is said to decrease on the chronic SDH side, especially if midline shift is present. Burr hole craniotomy with external drainage was performed, but the patient showed no change in CBF postoperatively, although the volume of hematoma decreased. The patient was clinically unchanged immediately after the operation. In this case, SPECT measurement of CBF was important in evaluating the pathophysiology of the delays in physical and mental growth. Atrophy of the bilateral hemispheres was the major mechanism in the decreased CBF, not the compression by chronic SDH. MR imaging and SPECT can determine the surgical indications for chronic SDH in patients with cortical atrophy.

Neuroimaging of intraparenchymal lesions predicts outcome in shaken baby syndrome

OBJECTIVE

Studies of long-term outcome on nonaccidental head injury (NAHI) in young children have shown severe neurodevelopmental sequelae in most cases. For improving the knowledge of outcome and for identifying prognostic factors, additional clinical and cerebral imaging data are needed. The aim of this study was to describe clinical and imaging features over time and to consider their value for predicting neurodevelopmental outcome.

METHODS

A retrospective medical record review was conducted of 23 children with confirmed NAHI, for whom an extended follow-up of 2.5 to 13 years (mean: 6 years) was contemplated. Glasgow Coma Scale scores, severity of retinal hemorrhages, presence of skull fractures, cranial growth deceleration, and sequential neuroimaging data (computed tomography and/or magnetic resonance imaging) were compared with patterns of clinical evolution assessed by the Glasgow Outcome Scale.

RESULTS

Clinical outcome showed that 14 (61%) children had severe disabilities, 8 (35%) had moderate disabilities, and 1 (4%) was normal. A low initial Glasgow Coma Scale score, severe retinal hemorrhages, presence of skull fracture, and cranial growth deceleration were significantly associated with poor developmental outcome. Eighteen of the 23 patients had abnormal magnetic resonance imaging scans. This examination disclosed atrophy when performed beyond 15 days of injury. Atrophy seemingly resulted from various brain lesions, namely, contusions, infarcts, and other lesions within the white matter. Presence of intraparenchymal brain lesions within the first 3 months was significantly associated with neurodevelopmental impairment. Severity of motor and cognitive dysfunctions was related to the extent of intraparenchymal lesions.

CONCLUSIONS

Early clinical and radiologic findings in NAHI are of prognostic value for neurodevelopmental outcome.

Diffusion-weighted MRI in shaken baby syndrome

We present the characteristic CT and MRI findings of a 2-month-old girl with shaken baby syndrome. Diffusion-weighted MR imaging performed 8 days after the insult established the presence of injury to the white matter in the corpus callosum and subcortical white matter in the temporo-occipito-parietal region. Diffusion-weighted MR imaging is valuable in the diagnostic work-up of suspected shaken baby syndrome, as injury to the white matter can be demonstrated days after the injury.

[Shaken baby syndrome--shaking violence against infants]

We describe two cases of shaken baby syndrome. Both children were about three months of age. It is important to recognise the characteristic features of this form of child abuse in order to prevent further damage and to ensure removal of the children from the abusive environment.