Hemangiosarcoma of the right atrium with multiple tumor metastases to the lungs in a Pomeranian

Cardiac tumors are rare in animals. They can be both primary and metastatic. The most common canine cardiac tumor is hemangiosarcoma. This is a malignant tumor that in most cases is localized in the right heart and metastasizes mainly to the lungs. The article presents a clinical case of right atrium hemangiosarcoma with metastatic lung lesions in a six-year-old Pomeranian. А tumor in the right atrium and а moderate amount of pericardial effusion was detected on echocardiography. However, chest X-ray data did not allow us to determine the presence of lung metastases, which were detected during autopsy. This clinical case demonstrates the characteristic localization of the tumor process, disease progression, as well as the limitations of chest X-ray examination for diagnosing metastatic lung lesions. Analysis of the clinical case confirms the need for a comprehensive diagnostic approach, including CT to assess the prevalence of the tumor process.