Imaging Features Differentiating Between Cardiac Sarcomas and Hematologic Neoplasms

Area of Science:

• Cardiovascular Imaging
• Oncology
• Radiology

Background:

• Primary cardiac malignancies, including sarcomas and hematologic neoplasms, are rare but life-threatening conditions.
• Accurate differentiation between these tumor types is crucial for appropriate patient management.
• Computed tomography (CT) and positron emission tomography (PET)/CT are key imaging modalities in evaluating cardiac masses.

Purpose of the Study:

• To evaluate the effectiveness of CT and PET/CT imaging features in distinguishing between primary cardiac sarcoma and cardiac hematologic neoplasms.
• To identify specific imaging characteristics that may help differentiate these rare cardiac malignancies.

Main Methods:

• Retrospective review of 69 pathology-proven cases (2012-2023) of cardiac sarcoma (n=46) and cardiac hematologic neoplasms (n=23).
• Analysis of imaging features including tumor size, atrioventricular groove involvement, right coronary artery encasement, pericardial effusion, lymphadenopathy, and fluorodeoxyglucose (FDG) PET metabolic activity.
• Statistical comparison using Fisher exact test and Wilcoxon test.

Main Results:

• Cardiac sarcoma patients were significantly younger (median 49 years) than those with hematologic malignancies (median 66 years).
• Hematologic malignancies showed a higher incidence of atrioventricular groove involvement (70% vs 43%) and right coronary artery encasement (52% vs 26%).
• Pulmonary metastases were more common in cardiac sarcomas (33% vs 4%), with no significant difference in FDG uptake or lymphadenopathy.

Conclusions:

• There is considerable overlap in imaging features between cardiac sarcomas and hematologic malignancies.
• Atrioventricular groove involvement and right coronary artery encasement may suggest a hematologic malignancy.
• Histopathological confirmation via biopsy is indispensable for a definitive diagnosis.