Cardiac angiosarcoma: utility of [¹⁸F]fluorodeoxyglucose positron emission tomography–computed tomography in evaluation of residue, metastases, and treatment response

Introduction

Sarcoma is the most common primary malignancy of the heart and pericardium. Primary cardiac sarcomas are rare entities,^1–3 with an autopsy prevalence of 0.001%–0.28%.³ Pathologic subtypes of primary cardiac sarcoma are angiosarcoma fibrosarcoma, rhabdomyosarcoma, malignant schwannoma, and mesothelioma. Frequency rate decreases in adults.

Angiosarcoma frequency is less than 1% among sarcomas. Of all angiosarcomas, a primary angiosarcoma of the heart and the great vessels accounts for only 3%.⁴ Most of cardiac angiosarcomas (80%) originate from right atrium as mural masses. Extension to the pericardium and encasement of the heart may be seen, and usually fills the entire cardiac chamber. The aggressive behavior of cardiac angiosarcomas causes early symptoms and a very short survival rate. Clinical presentation of sarcomas varies depending on the location, size, and extent of the tumor. Advanced diagnostic techniques facilitate accurate, noninvasive assessment of cardiac sarcomas.⁵

Diagnostic workup usually includes standard echo contrast-enhanced computed tomography (CT), magnetic resonance imaging, and angiography. In the literature, a few case reports have demonstrated the diagnostic contribution of [¹⁸F]fluorodeoxyglucose (FDG) positron emission tomography (PET)-CT in the evaluation of the malignant nature of disease and staging before deciding on the therapy aproach.^6,7

Even though cardiac angiosarcoma is rarely cured, surgical therapy is considered the best choice of therapy in nonmetastatic disease.⁸ Complete or partial surgical resection of primary or metastatic cardiac sarcoma can provide significant hemodynamic improvement, successful palliation, and prolonged survival.^9,10 Chemotherapy and postsurgical adjuvant radiotherapy have not proven consistently beneficial. However, all treatment choices after surgical resection can ameliorate symptoms with a varied response.¹¹

Case report

Herein, we report the case of a 62-year-old man who had previously undergone tumor resection for primary high-grade cardiac angiosarcoma (Figure 1) at a university hospital 4 months previously. The patient was referred to the Nuclear Medicine Department for ¹⁸F-FDG PET-CT imaging to assess residual and/or metastatic disease.

Figure 1 Histopathology findings.

The tumor was surgically approached by medial sternotomy, but complete tumor resection was not possible because of the extensive tumor infiltration. Palliative intervention consisting of partial excision of the tumor mass was aimed at releasing the right ventricular outflow tract.

PET-CT scans revealed a residual or relapsed mass in the right atrium, with significantly increased uptake of ¹⁸F-FDG (maximum standardized uptake value of 12). The mass extended to the mitral valve, septum, and left ventricle and infiltrated to the pericardium and adjacent mediastinum (Figure 2). The mass encased and almost completely replaced the atrial wall and nearly filled the entire cardiac chamber. Increased activity in the sternum was concomitant with sternotomy. PET-CT images also revealed multiple distant metastasis in the lung, liver, and bones (Figure 3). Despite receiving subsequent aggressive therapy, including radiotherapy, the patient died 8 months later.

Figure 2 18F-FDG PET-CT image showing the tumor mass in the right atrium. Abbreviations: CT, computed tomography; FDG, fluorodeoxyglucose; PET, positron emission tomography.

Figure 3 Maximum intensity projection image 18F-FDG PET-CT shows multiple distant metastasis in the lung, liver and bones. Abbreviations: CT, computed tomography; FDG, fluorodeoxyglucose; PET, positron emission tomography; dm, mean decimeter.

Conclusion

Angiosarcoma is a very aggressive malignant neoplasm with a short fatal clinical process, despite new, cutting edge, treatment modalities, such as extensive surgery, radiotherapy, and chemotherapy.¹² Nowadays, through advanced diagnostic technology, such as high-resolution CT, dynamic magnetic resonance imaging, and PET-CT, clinicians are able to diagnose in a shorter time, which allows for more effective radical surgical resection. ¹⁸F-FDG PET-CT seems to be an effective and feasible imaging modality to evaluate primary or postsurgical residue and/or relapse and metastases of the tumor.

Disclosure

The authors report no conflicts of interest in this work.

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