Step 1 topics → Psychiatry → Child Abuse and Neglect

Child Abuse and Neglect

USMLE Step 1 trap: Confuses spiral fracture as the hallmark abuse fracture rather than classic metaphyseal or posterior rib fractures. Spiral fractures result from rotational forces and can be accidental in ambulatory children; metaphyseal 'bucket-handle' fractures and posterior rib fractures are more specific for abuse.

Child abuse and neglect is one of those topics where USMLE Step 1 tests both pattern recognition and clinical decision-making in the same vignette. You need to identify red-flag findings that distinguish non-accidental trauma from accidental injury, know the specific pathology of abusive head trauma, and understand what triggers mandatory reporting. The exam will drop you into a pediatric vignette and expect you to connect the physical findings to the correct mechanism — or correctly identify what the physician must do next regardless of certainty.

The tricky part is that students often memorize the wrong fracture as the abuse hallmark (spiral fractures get all the attention, but they're the wrong answer), and they mentally require external head trauma before thinking 'shaken baby.' The exam exploits both of these. USMLE Step 1 also specifically tests the reporting threshold — students overthink this and assume you need proof before calling child protective services, which is exactly wrong.

Neglect is the third major trap: students dismiss it as less serious or less reportable than physical abuse, but it's actually the most common form of child maltreatment. The exam expects you to recognize failure to provide basic needs — food, shelter, medical care — as reportable maltreatment regardless of caregiver intent. Know all four types (physical, sexual, emotional abuse, and neglect), but especially know that neglect and abusive head trauma are the highest-yield clinical scenarios.

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Common misconceptions

Common mistake
Wrong: Spiral fractures are pathognomonic for child abuse.
Right: Spiral fractures result from rotational forces and can be accidental in ambulatory children; metaphyseal 'bucket-handle' fractures and posterior rib fractures are more specific for abuse.
Spiral fractures result from rotational forces and can absolutely occur accidentally in toddlers who are walking — a child tripping and twisting a leg is a perfectly plausible mechanism. The fractures that should immediately raise your concern for abuse are posterior rib fractures (from squeezing) and classic metaphyseal 'bucket-handle' or 'corner' fractures (from yanking/shaking), because these have no good accidental explanation in infants. On Step 1, if you see posterior rib fractures or metaphyseal fractures in an infant, that's your abuse signal — not a spiral fracture alone.
Common mistake
Wrong: External head trauma (scalp bruising, skull fracture) must be present to diagnose abusive head trauma.
Right: Abusive head trauma classically presents with subdural hematoma, retinal hemorrhages, and encephalopathy WITHOUT external signs of head impact, because the mechanism is acceleration-deceleration shearing.
Shaken baby syndrome (abusive head trauma) works by violent acceleration-deceleration — the brain moves inside the skull without anything hitting the head from the outside. That's why the classic presentation is subdural hematoma + retinal hemorrhages + encephalopathy with NO scalp bruising or skull fracture. If you're waiting for a bump on the head before considering this diagnosis, you'll miss it on the exam every time. Retinal hemorrhages in an infant with altered mental status and no clear mechanism should immediately make you think abusive head trauma.
Common mistake
Wrong: A physician must be certain abuse occurred before making a mandatory report.
Right: Mandatory reporting is triggered by reasonable suspicion of abuse, not confirmed diagnosis; the physician is not responsible for investigating or proving abuse.
Mandatory reporting laws are deliberately set at 'reasonable suspicion' — a low bar — because physicians are not investigators or prosecutors. Your job is to notice findings that don't fit the story and report them; it's the job of child protective services and law enforcement to determine what actually happened. USMLE Step 1 will give you a scenario where the diagnosis isn't confirmed but findings are concerning, and the correct next step is to report, not to wait for more evidence or defer to the family.
Common mistake
Wrong: Neglect requires intentional harm and is therefore less reportable than physical abuse.
Right: Neglect is the failure to provide basic needs (food, shelter, medical care, supervision) regardless of intent, and is actually the most common form of child maltreatment reported.
Neglect doesn't require intent to harm — it's defined by the failure to meet a child's basic needs (adequate nutrition, shelter, supervision, medical care), and intent is irrelevant to reporting. It's actually the most common form of child maltreatment in reported cases, outpacing physical and sexual abuse. A child brought in with failure to thrive because caregivers aren't feeding them adequately — whether intentional or not — meets the threshold for a neglect report.
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What the exam tests

  1. Identify physical findings that raise concern for non-accidental trauma versus accidental injury — including which fracture patterns, bruise locations, and injury-history mismatches are red flags for abuse.
  2. Understand the mechanism of abusive head trauma (acceleration-deceleration shearing), recognize the classic triad of subdural hematoma, retinal hemorrhages, and encephalopathy, and know why external head trauma is often absent.
  3. Know that mandatory reporting requires only reasonable suspicion of abuse — not certainty, not proof — and that the physician's role is to report, not to investigate.
  4. Distinguish the four types of child maltreatment (physical abuse, sexual abuse, emotional abuse, neglect), recognizing that neglect involves failure to provide basic needs regardless of intent and is the most commonly reported form.

Can you avoid these mistakes?

A 6-month-old is brought in unresponsive. The parents say he 'rolled off the couch.' Exam shows no scalp bruising or skull fracture, but head CT reveals bilateral subdural hematomas. Fundoscopic exam shows retinal hemorrhages. What is the diagnosis, and what do you do next?
A 2-year-old girl has an X-ray showing a spiral fracture of the tibia. Her mother says she tripped while running in the yard. Is this finding alone sufficient to diagnose abuse? What fracture patterns would be more specific for non-accidental trauma?
A pediatrician suspects a child may be experiencing abuse based on unexplained bruising in unusual locations and a history that keeps changing. The physician is not certain abuse occurred. What is the correct next step, and why?
A 14-month-old is brought in for poor weight gain. The parents are not intentionally withholding food — they are simply unaware of appropriate infant nutrition. Does this meet criteria for a reportable form of child maltreatment? What type, and why?

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