CTICasesMyocardial Fibroma
Imaging findings
Cardiac MRI demonstrates a large, well-circumscribed intramyocardial mass in the left ventricular wall. The lesion exhibits low signal intensity on T1-weighted and T2-weighted images, very low signal on steady-state free precession sequences, and demonstrates prominent, homogeneous, delayed enhancement. Histopathology confirms a dense, acellular collagenous fibroma.
Key takeaways
Myocardial fibromas are rare, benign cardiac tumors composed of dense fibrous tissue and collagen. Their MRI signature—specifically marked T1/T2 hypointensity and dense delayed enhancement due to the large extracellular collagen volume—is highly characteristic and helps differentiate them from other cardiac masses like rhabdomyomas or myxomas.
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