Infant Brain Bleeds: The Distinction Between Abuse and Medical Mimics
Why Subarachnoid Hemorrhage (SAH) is not diagnostic of abuse, and how conditions like BESS create false positives in "Shaken Baby" allegations.
In courtroom testimony, the term "Brain Bleed" is often used loosely. However, the type of bleed is the single most important factor in determining the likelihood of abuse versus accident. Anyone evaluating infant head trauma cases must understand the critical distinction between Subarachnoid Hemorrhage (SAH) and Subdural Hematoma (SDH) — and the medical mimics that can produce identical findings without any abuse.
1. The Critical Distinction: SAH vs. SDH
In courtroom testimony, the term "Brain Bleed" is often used loosely. However, the type of bleed is the single most important factor in determining the likelihood of abuse versus accident.
Subarachnoid Hemorrhage (SAH)
Bleeding below the arachnoid membrane.
Subdural Hematoma (SDH)
Bleeding between the dura and arachnoid (bridging veins).
2. The "Silent" Mimic: BESS (Benign Enlargement of Subarachnoid Spaces)
Also known as BESSI (Benign External Hydrocephalus). Infants with this condition have enlarged fluid spaces around the brain, stretching the bridging veins. A minor, witnessed fall or even normal handling can cause a subdural bleed in these children.
Clinical Checklist: Identifying BESS
- 1. Was the child's head circumference >90th percentile (Macrocephaly)?Check Records
- 2. Does the CT show "widened anterior subarachnoid spaces"?Review Radiology
- 3. Is there a family history of large heads (often the father)?Ask Client
*If BESS is present, a diagnosis of "Abusive Head Trauma" based solely on SDH should be evaluated with caution, as BESS can independently explain SDH without other injuries.
3. Retinal Hemorrhages (RH): Nuance Matters
The statement "Retinal Hemorrhages equal shaking" is an oversimplification. The pattern is what matters.
| Feature | Associated with Abuse | Alternative / Equivocal |
|---|---|---|
| Location | Extend to Periphery (Ora Serrata) | Posterior Pole Only (near optic nerve) |
| Layers | Multi-layered (Pre-retinal, intra-retinal) | Single layer |
| Quantity | "Too many to count" | Few / Isolated |
Questions for the Medical Expert
Counsel for either party may explore these questions to evaluate whether a diagnosis reflects complete exclusion of medical mimics.
"Doctor, you noted Subdural Hemorrhage. Did you measure the subarachnoid spaces to rule out Benign Enlargement (BESS), which predisposes infants to bleeding with minimal force?"
"Did you run a Factor XIII assay? Standard coagulation panels (PT/PTT) do not detect this specific bleeding disorder which can cause spontaneous intracranial hemorrhage."
"Regarding the Retinal Hemorrhages: Were they confined to the posterior pole? Isn't it true that posterior pole hemorrhages can occur from increased intracranial pressure (ICP) alone, regardless of the cause?"
4. Coagulation Disorders: An Often Overlooked Consideration
Standard coagulation panels (PT/PTT) do not detect all bleeding disorders. Factor XIII deficiency, for example, can cause spontaneous intracranial hemorrhage in infants and is missed by routine testing. A full thrombophilia workup — including Factor XIII assay, fibrinogen level, and platelet function studies — should be considered.
Documentation gap:
If a Factor XIII assay was not ordered, a diagnosis of "Abusive Head Trauma" may be incomplete. A negative standard coagulation panel does NOT rule out a bleeding disorder.
Definitions for Legal Review
- SAH (Subarachnoid Hemorrhage): Bleeding in the space between the brain surface and arachnoid membrane. Common in accidental injury and NOT a distinguishing feature of abuse per AAP 2025 guidelines.
- SDH (Subdural Hematoma): Bleeding between the dura and arachnoid layers, caused by tearing of bridging veins. Highly associated with abusive head trauma but can also result from BESS, birth trauma, or re-bleeds.
- BESS (Benign Enlargement of Subarachnoid Spaces): A condition where enlarged fluid spaces stretch bridging veins, predisposing infants to subdural bleeds from minimal or no trauma.
- Factor XIII Deficiency: A rare bleeding disorder undetectable by standard PT/PTT panels that can cause spontaneous intracranial hemorrhage.
Key Points for Legal Review
- ✅SAH alone is NOT diagnostic of abuse — the specific bleed type should be distinguished
- ✅BESS (macrocephaly, widened subarachnoid spaces) must be ruled out before diagnosing AHT
- ✅Retinal hemorrhage pattern matters more than presence — posterior pole RH can occur from elevated ICP
- ✅Factor XIII and other rare bleeding disorders are missed by standard coagulation panels
- ✅If an expert did not exclude all medical mimics, the diagnosis may be incomplete
Conclusion
Infant brain bleed cases are among the most emotionally charged in all of litigation. The science, however, demands precision. SAH is not SDH. BESS can cause SDH without abuse. Retinal hemorrhages require pattern analysis, not binary interpretation. And standard coagulation panels miss critical bleeding disorders. Counsel for either party benefits from understanding these distinctions, and an independent pediatric emergency medicine expert witness capable of explaining them can help ensure that diagnoses presented as certainties are evaluated in the context of the complete medical record.
References
- 1. American Academy of Pediatrics. Technical Report: Abusive Head Trauma in Infants and Children. Pediatrics. 2025.
- 2. Vinchon M, et al. Subdural Hematomas in Infants: Can They Occur Spontaneously? Data from a Prospective Series. Childs Nerv Syst. 2010;26(10):1345-1351.
- 3. Greiner MV, et al. Retinal Hemorrhages in Abusive Head Trauma. J AAPOS. 2021;25(4):228.e1-228.e7.
- 4. McKeag H, et al. Subdural Hemorrhage in Pediatric Patients with Enlargement of the Subarachnoid Spaces. J Neurosurg Pediatr. 2013;11(4):438-444.
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