LV Fibroma vs Rhabdomyoma

Echo-focused differentiating points 👉:

Rhabdomyoma: Usually multiple, homogeneous echogenic masses, intramyocardial, no calcification, often in infants, tendency to regress.

Fibroma: Typically solitary, very bright echogenic mass with shadowing due to calcification, well-circumscribed, often larger, does not regress, commonly in LV free wall or septum.

To confirm LV fibroma vs rhabdomyoma, the key modality is Cardiac MRI — echo alone cannot definitively distinguish them. Here’s the clean, practical approach used clinically:

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✅ How to Confirm LV Fibroma vs Rhabdomyoma

1. Cardiac MRI (Gold Standard)

Rhabdomyoma

T1: Iso / mildly hyperintense

T2: Hyperintense

LGE: No or minimal enhancement

Often multiple lesions

Fibroma

T1: Hypointense

T2: Hypointense

LGE: Intense, central enhancement (classic “bright core”)

Well-defined, usually solitary

→ Pattern of LGE is the single best differentiator.

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2. Clinical Clues

Rhabdomyoma

Infant with multiple masses

Features of Tuberous sclerosis

Tumor shrinking on follow-up scan

Fibroma

Older child

Solitary, large LV wall mass

Ventricular arrhythmias (common)

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3. Follow-up Imaging

Rhabdomyoma decreases over months

Fibroma stays same or increases → confirms fibrotic tumor

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4. Genetic / Syndromic Workup

If rhabdomyoma suspected → Tuberous sclerosis evaluation (TSC1/TSC2)

Fibroma has no strong genetic link

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5. Histology (rarely needed)

Only if diagnosis unclear or mass causing severe symptoms

Surgery + biopsy mainly for fibroma

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⭐ Practical Rule

If MRI shows strong central LGE → fibroma.

If MRI shows no LGE and multiple lesions → rhabdomyoma.

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