Pediatric Imaging

Imaging Suspected Abdominal Abuse in a Toddler: Which Study Does the ACR Recommend First?

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Imaging Suspected Abdominal Abuse in a Toddler: Which Study Does the ACR Recommend First?

It’s a busy evening shift in the emergency department when you evaluate a quiet 3-year-old brought in for “falling down the stairs.” During the examination, you note patterned bruising across the child’s abdomen and flank, and the child winces with palpation. The history doesn’t quite match the physical findings, raising concern for non-accidental trauma. You know imaging is necessary to evaluate for internal injury, but which study provides the most diagnostic information while balancing radiation exposure in a young child? This article details the American College of Radiology (ACR) Appropriateness Criteria for this specific scenario, guiding you through the recommended imaging workflow. For suspected visceral injury in a child over 24 months, both Radiography area of interest and CT abdomen and pelvis with IV contrast are rated Usually Appropriate.

Who Fits This Clinical Scenario?

This guidance applies specifically to children older than 24 months who present with clinical findings suspicious for physical abuse that suggest potential injury to the internal organs of the chest or abdomen. The key inclusion criteria are:

  • Age: Greater than 24 months.
  • Clinical Findings: One or more signs concerning for visceral injury. This includes abdominal pain, tenderness, distention, or external signs of trauma to the trunk such as bruising, hematomas, abrasions, or patterned skin injuries.

It is crucial to distinguish this scenario from others that require a different imaging approach. This guidance does not apply to:

  • Children 24 months of age or younger: In infants and younger toddlers, the threshold for obtaining a full radiographic skeletal survey is much lower, and this investigation is a central part of the workup.
  • Patients with primary neurologic concerns: If the child presents with altered mental status, seizures, or focal neurologic deficits suggesting a Central Nervous System (CNS) injury, the imaging algorithm prioritizes neuroimaging like head CT or MRI.
  • Follow-up imaging: This article addresses the initial imaging workup. Subsequent imaging decisions would be guided by the initial results and the child’s clinical course.

What Diagnoses Are You Working Up in This Scenario?

In cases of suspected physical abuse involving blunt force to the torso, the imaging workup is designed to identify a range of potentially life-threatening injuries. The differential diagnosis is broad and includes injuries that may have few, if any, specific external signs.

Solid Organ Injury: The liver and spleen are the most commonly injured abdominal organs in blunt trauma. Lacerations can range from minor subcapsular hematomas to deep parenchymal injuries with active hemorrhage. Pancreatic or adrenal injuries are less common but are highly specific for non-accidental trauma, as they require significant focused force.

Hollow Viscus Injury: Injury to the bowel or stomach is a critical diagnosis to make, as delayed recognition can lead to peritonitis and sepsis. A classic finding is a duodenal hematoma, which can cause a gastric outlet obstruction. Frank perforation of the bowel is a surgical emergency and may present with free intraperitoneal air.

Thoracic and Bony Injury: Direct blows to the chest or abdomen can cause rib fractures. While a single accidental rib fracture is possible, the presence of multiple fractures, especially posterior rib fractures, is highly suspicious for abuse. Fractures of the sternum or spine are also possible.

Renal and Urinary Tract Injury: The kidneys are relatively protected, but significant force can cause contusions, lacerations, or vascular injury. These injuries are often associated with hematuria, though its absence does not exclude significant injury.

Why Radiography and CT Are the Recommended Studies for This Presentation

For a child over 24 months with suspected visceral injury from abuse, the ACR designates two modalities as Usually Appropriate: Radiography area of interest and CT abdomen and pelvis with IV contrast. The choice between them depends on the specific clinical question.

If the primary concern is for bony injury, such as rib fractures identified on palpation, a Radiography area of interest (e.g., a rib series or chest radiograph) is an excellent first step. It is fast, widely available, and uses a relatively low dose of radiation (Pediatric RRL=Varies). An abdominal radiograph can also be used to look for signs of bowel obstruction or perforation (free air).

However, for the direct evaluation of suspected solid organ or hollow viscus injury, CT abdomen and pelvis with IV contrast is the gold standard. It provides detailed cross-sectional anatomy, allowing for the precise identification and grading of injuries to the liver, spleen, pancreas, and kidneys. The intravenous contrast is essential for highlighting organ parenchyma and identifying active bleeding. While it involves a higher radiation dose (Pediatric RRL=☢☢☢☢ 3-10 mSv), its high diagnostic accuracy is indispensable when visceral injury is a primary concern.

Why are other studies rated lower?

  • US abdomen is rated Usually Not Appropriate. While ultrasound involves no radiation (Pediatric RRL=O 0 mSv) and can be useful for focused questions (FAST exam in trauma), it is highly operator-dependent. Bowel gas can obscure the pancreas and other retroperitoneal structures, and ultrasound is less sensitive than CT for detecting subtle organ lacerations, bowel wall hematomas, or active bleeding.
  • CT abdomen and pelvis without IV contrast is also rated Usually Not Appropriate. Omitting IV contrast severely limits the evaluation of solid organs, making it difficult to distinguish hematomas from normal tissue and impossible to assess for vascular injury or active extravasation.
  • A Radiography skeletal survey is rated May be appropriate (Disagreement). In children over two, the diagnostic yield for finding occult fractures is lower than in infants. The decision to perform a full survey is often made in consultation with a child abuse specialist and depends on the overall clinical picture, not just the abdominal findings.

What’s Next After Initial Imaging? Downstream Workflow

The results of the initial imaging study will dictate the immediate next steps in management, which must always be coordinated with child protective services and, ideally, a multidisciplinary child abuse team.

  • Positive for Significant Injury: If CT reveals a high-grade solid organ laceration, active bleeding, or bowel perforation, immediate consultation with pediatric surgery and/or interventional radiology is mandatory. The child will require hospital admission, potentially to an intensive care unit, for close monitoring, resuscitation, and possible surgical or endovascular intervention.
  • Positive for Minor Injury: Findings like a low-grade liver contusion, small duodenal hematoma, or non-displaced rib fractures may be managed non-operatively. This still requires hospital admission for serial abdominal exams, monitoring of vital signs and hemoglobin, and pain control.
  • Negative Imaging: A negative CT scan is highly reassuring for the absence of significant visceral injury. However, if the clinical suspicion for abuse remains high based on physical exam findings or history, the child should still be admitted for observation. A negative scan does not rule out abuse; it only rules out certain injuries. The focus then shifts to ensuring the child’s safety and completing the social and protective evaluation.
  • Indeterminate Findings: In rare cases, a finding may be equivocal. This might prompt a different imaging modality (e.g., MRI for a complex pancreatic injury) or a period of close observation with planned follow-up imaging.

Pitfalls to Avoid (and When to Get Help)

Navigating a case of suspected abuse is clinically and emotionally complex. Several pitfalls can compromise the diagnostic process and patient safety.

  • Underestimating the Mechanism: Do not dismiss significant internal injuries just because external signs seem minor. Significant force is required to injure the internal organs of a child.
  • Accepting an Inconsistent History: A discrepancy between the reported mechanism and the physical findings is a major red flag for non-accidental trauma. Document this clearly and activate your institution’s child protection protocol.
  • Ordering the Wrong CT Protocol: Always specify “with IV contrast” when ordering CT for visceral injury. Ensure your radiology department uses pediatric-specific, dose-optimized protocols to adhere to the As Low As Reasonably Achievable (ALARA) principle.
  • Failure to Escalate: If you are suspicious of abuse, it is your responsibility to report it. If the imaging findings are complex or the clinical picture is deteriorating, escalate immediately to a pediatric surgeon, critical care specialist, and your institution’s child abuse pediatrician or team.

Related ACR Topics and Tools

The ACR Appropriateness Criteria are a comprehensive resource for evidence-based imaging decisions. For this clinical topic, the following gighz.com resources can provide additional context and support for your workflow.

Frequently Asked Questions

Why are both radiography and CT rated ‘Usually Appropriate’ for this scenario?

They answer different clinical questions. Radiography of the ‘area of interest’ (e.g., chest or abdomen) is excellent for evaluating the bony structures like ribs for fractures. CT with IV contrast is the definitive study for evaluating the internal solid and hollow organs for injury. If your primary concern is a rib fracture, a radiograph is a great start. If you are concerned about a liver laceration or bowel injury, a CT scan is necessary.

Is a full skeletal survey necessary for a 3-year-old with abdominal bruising?

Not always. For children over 24 months, the ACR rates a full radiographic skeletal survey as ‘May be appropriate (Disagreement)’. The yield of finding occult fractures is lower in this age group compared to infants. The decision is typically made in consultation with a child abuse specialist and is based on the entire clinical picture, not just the abdominal findings. It is not a routine part of the initial workup for isolated suspected abdominal injury.

What if the only finding is abdominal bruising without pain or tenderness?

The presence of truncal bruising, especially patterned bruising, in a location not typically injured by accidental falls (e.g., flank, back, abdomen) is highly suspicious for abuse, even without tenderness. Given that significant internal injuries can present with minimal initial symptoms, a low threshold for obtaining a CT scan of the abdomen and pelvis with IV contrast is warranted, along with laboratory tests like a complete blood count and liver function tests.

Is there any role for ultrasound, even though it’s rated ‘Usually Not Appropriate’?

While the ACR rates formal diagnostic abdominal ultrasound as ‘Usually Not Appropriate’ for the definitive workup, a point-of-care ultrasound (POCUS) or FAST (Focused Assessment with Sonography for Trauma) exam may be used in the initial resuscitation of an unstable child to rapidly look for free fluid (hemoperitoneum). However, it cannot replace CT for a comprehensive evaluation and should not be used to rule out visceral injury in a stable child.

Does a negative CT scan rule out physical abuse?

No. A negative CT scan is very effective at ruling out significant abdominal visceral injury, but it does not rule out the possibility of physical abuse. The abuse may have involved other body regions not imaged, or it may not have resulted in an injury detectable by CT. The clinical suspicion, physical exam findings, and social situation remain paramount, and a report to child protective services is still mandatory if abuse is suspected.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 30, 2026