In a 27‑year‑old patient with congenital infiltrating lipomatosis of the face who has a small pontine hemorrhage, is this bleed due to an aneurysm?

A small pontine bleed in a 27-year-old with CILF is unlikely to be aneurysmal and requires urgent vascular imaging to exclude macrovascular causes.

In this young patient with posterior fossa hemorrhage, you should immediately obtain CTA with consideration of venography, and if negative or inconclusive, proceed to catheter angiography (DSA) to definitively exclude an aneurysm or other macrovascular cause 1.

Why This Matters

The 2022 AHA/ASA guidelines are explicit: for patients under 45 years old with deep or posterior fossa hemorrhage (which includes pontine bleeds), there is a 1 in 4 to 1 in 7 chance of finding an underlying macrovascular cause such as arteriovenous malformations, aneurysm, dural arteriovenous fistula, cavernoma, or cerebral venous thrombosis 1. This high yield mandates aggressive vascular imaging.

Diagnostic Algorithm

1. Immediate CTA head plus venography 1

   • Sensitivity and specificity >90% for intracranial vascular malformations
   • Venography is critical to exclude cerebral venous thrombosis
   • Can be performed acutely and is non-invasive

2. If CTA is negative or inconclusive: Proceed to catheter DSA 1

   • Gold standard for detecting macrovascular causes
   • Highest diagnostic yield in young patients with posterior fossa hemorrhage
   • Particularly important given your patient's age (27 years) and location (pons)

3. If DSA is negative: Obtain MRI/MRA 1

   • Identifies non-macrovascular causes: cavernous malformation, deep perforating vasculopathy, or malignancy
   • MRI better characterizes blood products and underlying structural lesions 2

4. If initial workup is negative: Consider repeat DSA at 3-6 months 1

   • May identify previously obscured vascular lesions
   • Particularly relevant if no clear microvascular diagnosis is established

The CILF Connection

While CILF itself is a benign adipose overgrowth disorder 3, 4, 5, there is no established association between CILF and intracranial aneurysms or pontine hemorrhage. One case report describes CILF with schizencephaly 3, but this represents a developmental brain malformation, not a vascular cause of hemorrhage.

Critical Pitfalls to Avoid

• Don't assume the bleed is hypertensive without excluding macrovascular causes—your patient is only 27 years old
• Don't stop at negative CTA—proceed to DSA given the high-risk features (young age, posterior fossa location, no hypertension history)
• Don't attribute the bleed to CILF—there is no pathophysiologic link between this facial lipomatosis and intracranial hemorrhage
• Don't delay imaging—aneurysms can rebleed, with mortality rates of 80% for ruptured versus 30% for unruptured lesions 6

Special Consideration: Perforator Rupture

One rare entity to consider is perimesencephalic hemorrhage with pontine infarction from basilar perforator rupture 7. However, this typically presents with perimesencephalic (not intraparenchymal pontine) hemorrhage and would still require angiography to exclude aneurysm.

Bottom Line

Your patient requires urgent vascular imaging with CTA followed by DSA if needed—not because of CILF, but because any 27-year-old with a pontine bleed has a substantial risk of harboring a treatable macrovascular lesion that could rebleed with devastating consequences.