Clinical introduction A 76-year-old man with 50 years of smoking history was diagnosed in 2012 with diffuse interstitial lung disease, with radiological data of usual interstitial pneumonia. He came to the emergency room presenting with progression of dyspnoea for 1 week, concomitant with loss of 5 kg of weight, anorexia and poor general condition. He had tachypnoea at rest (30 breaths/min), peripheral cyanosis, speech interfered by cough and breathlessness, baseline oxygen saturation 90%, heart rate 40 beats/min and blood pressure 130/70 mm Hg. Chest X-ray was performed and there was basal atelectasia of the right lung. ECG and urgent echocardiogram (transthoracic echocardiogram, TTE) were also performed (figure 1).
- cardiac computer tomographic (CT) imaging
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The ECG showed atrium-ventricular (AV) dissociation with narrow QRS complex escape at 40 bpm, findings which are compatible with complete AV block and not with Mobitz II second-degree AV block (figure 2A).
On the other hand, the patient did not feel chest pain, the ECG also showed no changes in repolarisation, and the serial determination of markers of myocardial damage (creatine kinase, troponin I) was negative, which rules out a non-ST elevation myocardial infarction.
In the TTE we observed a hyperechogenic nodular image infiltrating both atria and thickening of the interatrial septum (figure 2B,C). The fact that the image infiltrates underlying tissue, affecting several cardiac chambers, increases the likelihood of a malignant process and it made less likely that it was a benign tumour like myxoma (characterised by a pedunculated and mobile image in any of the atria without infiltration).
Although our first impression was a malignant process that was infiltrating the heart, a thoracic CT was performed, first to rule out pulmonary embolism, which was discarded, and second to characterise better the image observed in the TTE. The CT findings supported that with high probability it was a lymphoproliferative process (online supplementary figure 1).
Supplementary file 1
Unfortunately, on the sixth day of admission, the patient died, and the autopsy confirmed that it was a diffuse large B-cell type lymphoma (online supplementary figure 2).
Supplementary file 2
Of all primary cardiac tumours, lymphomas are extremely rare and type B is the most prevalent.1 2 They usually remain asymptomatic until the very advanced stages of the disease. Atrial arrhythmias and conduction abnormalities are not very common, each occurring in approximately 25% of patients.3 TTE is the tool that establishes the diagnosis of suspicion and CT provides more information about the type of tumour (eg, vascularisation, necrosis).4 But despite all the diagnosis of certainty is always histological.
Contributors JMM: selection of the images, case writting, case edition. AJMB and MC: selection of the images and case edition. Alvaro Trascasa: pathology images. Marta Repollés: CT images.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.