Cardiac hemangioma is a rare benign vascular tumor of the heart, constituting 2-5% of all primary cardiac tumors. It can originate from any cardiac chamber, pericardium, or myocardium, but is most commonly found in the right atrium and right ventricle. Histologically, it can be cavernous, capillary, or mixed type; the cavernous type is the most common form. It can occur at any age with no gender predilection. Most are asymptomatic and discovered incidentally; however, depending on size and location, they may present with arrhythmia, pericardial effusion, outflow tract obstruction, or rarely tamponade. On MR, the 'light bulb' sign (marked hyperintensity on T2) and progressive enhancement pattern (fill-in) are characteristic.
Age Range
20-70
Peak Age
45
Gender
Equal
Prevalence
Rare
Cardiac hemangiomas are true vascular neoplasms or vascular malformations arising from abnormal proliferation of endothelial cells. In the cavernous type, large, irregular, thin-walled vascular spaces are lined by endothelium and filled with slowly flowing blood; this explains the T2 hyperintensity on MR and progressive fill-in pattern on dynamic contrast studies. In the capillary type, small, uniform capillary-like vessels predominate. Within the vascular spaces of the tumor, slow flow, thrombosis, and organized blood products can accumulate, which is why heterogeneous T1 signal (methemoglobin = T1 bright) may be seen. The presence of phleboliths (calcified thrombus) is a relatively specific finding for cavernous hemangioma. Smooth muscle and fibrous tissue are found in the walls of vascular channels. Flow voids originate from intratumoral or surrounding large vascular structures and represent feeding vessels. The growth mechanism is more vascular malformation expansion than true neoplastic proliferation.
When the markedly hyperintense signal on T2-weighted sequences ('light bulb' sign, near-fluid brightness) and progressive peripheral-to-central filling (fill-in) pattern on dynamic contrast sequences are evaluated together, they are considered pathognomonic for cardiac hemangioma diagnosis. This combination directly reflects the benign vascular structure of the lesion filled with large vascular spaces. The same pattern is seen in liver, spleen, and soft tissue hemangiomas and is known as the 'hemangioma phenomenon.' Complete fill-in may take minutes — delayed phase imaging is mandatory especially for large lesions.
On T2-weighted sequences, cardiac hemangioma demonstrates markedly hyperintense signal — comparable to fluid/CSF brightness ('light bulb' sign). This finding reflects slowly flowing blood and areas of stasis in the tumor's large vascular spaces. It may be homogeneous or slightly heterogeneous — heterogeneity is due to thrombosis, fibrosis, or hemosiderin deposition. Hyperintensity is more pronounced in the cavernous type, while it may be slightly lower in the capillary type.
Report Sentence
Markedly hyperintense signal in the mass on T2-weighted sequences ('light bulb' sign), consistent with vascular lesion/hemangioma.
On T1-weighted sequences, cardiac hemangioma typically shows isointense to slightly hyperintense signal relative to myocardium. It may be heterogeneous — T1 hyperintense areas are due to intratumoral hemorrhage (subacute methemoglobin), thrombosis, or high protein content fluid. Hemosiderin deposition in chronic hemorrhage areas may create low signal areas. This heterogeneous signal pattern helps differentiate from simple cystic lesions (homogeneous) and solid tumors (homogeneous intermediate).
Report Sentence
Heterogeneous signal in the mass on T1-weighted sequences with hyperintense areas consistent with intratumoral hemorrhage/thrombosis.
On dynamic contrast-enhanced MR, cardiac hemangioma demonstrates progressive peripheral-to-central enhancement (fill-in) pattern. Early phase shows peripheral nodular enhancement that progresses centrally in later phases, eventually filling the lesion completely. This pattern reflects slow diffusion of contrast into the large vascular spaces of cavernous hemangioma and is pathognomonic for hemangiomas at all locations (liver, spleen, vertebra, etc.). Small lesions may show early homogeneous enhancement (flash-filling). Thrombosed areas show no enhancement.
Report Sentence
Progressive peripheral-to-central fill-in enhancement pattern in the mass on dynamic contrast-enhanced imaging, consistent with hemangioma.
On SSFP cine sequences, areas of low signal (flow voids) may be observed within the hemangioma. These flow voids represent high-velocity vascular structures feeding the tumor or passing through it. While the soft tissue component of the hemangioma shows bright SSFP signal, areas of rapid flow show signal loss. The mass is typically well-defined with lobulated or polypoid morphology. Mass mobility and relationship with surrounding structures can be dynamically assessed on cine sequences. Oscillatory motion may be seen in lesions protruding into chamber lumens.
Report Sentence
Flow voids are identified within the mass on SSFP cine sequences, consistent with vascular architecture.
On contrast-enhanced CT, cardiac hemangioma shows progressive enhancement. It begins with peripheral enhancement in the early arterial phase and progresses centrally in later phases (CT equivalent of MR fill-in pattern). It is a well-defined, lobulated mass. On non-contrast CT, punctate calcifications from phleboliths (calcified thrombus) may be seen in cavernous type — this finding is highly specific for cavernous vascular malformations. The lesion is of soft tissue density on CT, and cystic areas/vascular spaces may appear as low-density regions.
Report Sentence
Progressive peripheral-to-central enhancement in the mass on contrast-enhanced CT with punctate calcifications (phleboliths), consistent with vascular lesion/hemangioma.
On echocardiography, cardiac hemangioma appears as a well-defined mass with heterogeneous echogenicity. Internal structure may contain both hyperechoic and hypoechoic areas — reflecting vascular spaces and fibrous/thrombotic areas. Color Doppler may detect vascular flow within the mass; this finding helps differentiate from avascular masses (myxoma, thrombus). Contrast echocardiography (microbubbles) can demonstrate late and progressive enhancement. The lesion is typically broad-based and originates from myocardium or endocardium.
Report Sentence
Well-defined mass with heterogeneous echogenicity on echocardiography with intramass vascular flow detected on color Doppler.
Criteria
Large, irregular, thin-walled vascular spaces; slow flow; markedly hyperintense T2; progressive fill-in; calcifications from phleboliths may be seen
Distinct Features
Most common histologic type (50-60%). The 'light bulb' sign is most pronounced in this type due to large vascular spaces. Complete fill-in may take 10-15 minutes in large lesions. Phleboliths are relatively specific to this subtype. Spontaneous thrombosis and hemorrhage complications are more frequent.
Criteria
Small, uniform, capillary-like vessel structures; more homogeneous architecture; early and rapid enhancement ('flash-filling'); T2 hyperintense but not as pronounced as cavernous
Distinct Features
Less frequent (20-30%). Shows early and rapid homogeneous enhancement (flash-filling) due to small capillary structures. T2 hyperintensity is slightly less than cavernous type. Phleboliths are not seen. Tends to be smaller in size. More closely related to true neoplasm than vascular malformation.
Criteria
Both cavernous and capillary components present; heterogeneous enhancement pattern; variable T2 hyperintensity; partially rapid, partially progressive filling
Distinct Features
Histologically seen in 20-30% of cases. Carries features of both components. Enhancement pattern can be heterogeneous — capillary areas fill rapidly, cavernous areas progressively. This subtype can create diagnostic difficulty and requires evaluation of all sequences together. Size and location variability is greatest in this type.
Distinguishing Feature
Angiosarcoma is an aggressive, invasive, irregularly bordered malignant tumor that causes pericardial effusion/invasion. It shows high T1 signal (hemorrhage) but enhancement pattern is heterogeneous and rapid — does not show fill-in pattern. Hemangioma is well-defined, benign, shows progressive fill-in pattern, and does not invade. Angiosarcoma shows rapid growth and metastasis while hemangioma is stable.
Distinguishing Feature
Myxoma typically originates from fossa ovalis in the left atrium as a pedunculated, mobile mass. May be hyperintense on T2 but not as bright as 'light bulb.' Shows heterogeneous enhancement but not progressive fill-in pattern. Myxoma causes embolic complications while hemangioma does not. Calcification in myxoma may be peripheral eggshell-type while in hemangioma it is phlebolithic-type.
Distinguishing Feature
Paraganglioma is a hypervascular mass in the AV groove showing salt-and-pepper pattern on T2, intense enhancement, and positive MIBG uptake. Hemangioma shows homogeneous T2 hyperintensity ('light bulb'), progressive fill-in, and no MIBG uptake. Paraganglioma may have symptoms like hypertension, palpitations, sweating from catecholamine secretion.
Distinguishing Feature
Pericardial cyst is a thin-walled, unilocular, water-density cystic lesion. May be very bright on T2 (fluid signal) but shows no contrast enhancement — neither peripheral nor fill-in. On CT it has water density (0-20 HU). Hemangioma has a solid-vascular structure, shows enhancement, and has soft tissue density on CT. Pericardial cyst most commonly located at the right cardiophrenic angle.
Urgency
lowManagement
conservative-to-surgicalBiopsy
Not NeededFollow-up
Asemptomatik küçük lezyonlarda yıllık MR takibi. Semptomatik veya büyüyen lezyonlarda cerrahi rezeksiyon.Cardiac hemangioma is a benign tumor, mostly asymptomatic and incidentally discovered. Diagnosis is typically made with characteristic 'light bulb' sign and progressive fill-in enhancement pattern on MR; biopsy is rarely needed. Conservative observation with annual MR follow-up is recommended for asymptomatic small lesions. Surgical resection is indicated in symptomatic cases (arrhythmia, obstruction, pericardial effusion), large lesions causing hemodynamic effects, or growing lesions. Post-surgical prognosis is excellent and recurrence is rare. Histological confirmation is obtained only from surgical resection material or endomyocardial biopsy in cases of diagnostic uncertainty.
Cardiac hemangioma is a rare but benign tumor. Most are asymptomatic and detected incidentally. Depending on location, arrhythmias, pericardial effusion, outflow tract obstruction, or heart failure can develop. Characteristic T2 hyperintensity and progressive fill-in pattern on MRI are diagnostic. Surgical resection is curative in symptomatic cases and recurrence is rare. Differentiation from malignant vascular tumors such as angiosarcoma is critically important.