case_images: PMC9279725_01
case_images: (A) Electrocardiogram showing poor R waves in V5 and V6, as well as QS waves in the precordial and inferior leads. (B) Parasternal short-axis view of transthoracic echocardiography (TTE) detecting an isolated giant mass (26 x 30 mm) in the right atrium (red arrow). (C) Four-chamber view with color-Doppler of TTE showing a giant mass in the right atrium (red arrow) and severe mitral regurgitation. (D) T1-weighted imaging of cardiac magnetic resonance imaging (CMR) indicating the mass in the right atrium (red arrow) with medium-to-high signal intensity. (E) Delayed enhancement imaging of CMR identifying a thrombotic nature mass (red arrow). TTE, transthoracic echocardiography; CMR, cardiac magnetic resonance imaging.
case_images: fcvm-09-954850-g001.jpg
case_images: PMC9279725_01_fcvm-09-954850-g001.jpg
case_images: F1
case_images: An electrocardiogram demonstrated poor R waves in V5 and V6 as well as QS waves in the precordial and inferior leads (Figure 1A). Of note, the TTE depicted a homogeneous hypoechoic, hypermobile giant mass (26 x 30 mm) in the right atrium attached to the anterior atrial wall via a stalk (Figures 1B,C). T1- and T2-weighted perfusion images indicated hypointense characteristics of this RA mass, and delayed enhancement imaging showed a homogeneous gray mass with a dark rim and no uptake of contrast, suggesting a mass of a thrombotic nature, rather than a myxoma or malignant tumor (Figures 1D,E).
case_images: (A,B) Computed tomography showing a spiculated mass (35 x 20 mm) in the lower right lung lobe. (C,D) H&E staining identifying lung squamous cell carcinoma with no keratinization but well-defined nests. H&E, hematoxylin and eosin staining.
case_images: fcvm-09-954850-g002.jpg
case_images: PMC9279725_01_fcvm-09-954850-g002.jpg
case_images: F2
case_images: Computed tomography scans demonstrated a spiculated mass lesion measuring 35 x 20 mm in the lower right lung lobe (Figures 2A,B), which was further confirmed by an endobronchial biopsy as lung squamous cell carcinoma (Figures 2C,D).