Diagnostic value of contrast-enhanced ultrasonography in mediastinal leiomyosarcoma mimicking aortic hematoma: A case report and review of literature

Figure 1 Computed tomography angiography and positron emission tomography/computed tomography transverse section images. A: Computed tomography (CT) scan; B: Contrast-enhanced CT scan at approximately the same anatomic level. A circular mass with a patchy high-density enhanced signal was found around the lower thoracic aorta. The mass showed heterogeneous enhancement on the contrast-enhanced CT scan; C: CT scan 1 mo later; D: Positron emission tomography scan at the same anatomic level 1 mo later. The mass had significantly increased, still surrounding the lower thoracic aorta. The high-density part of the mass had increased fluorodeoxyglucose (FDG) metabolism, whereas the low-density part had decreased FDG metabolism.