Bilateral Pulmonary Embolism in Patients Recovered From Asymptomatic COVID-19 Infection

Multi-territory stroke preceded by pulmonary embolism with asymptomatic coronavirus disease 2019: a case report

Background

Non-bacterial thrombotic endocarditis is characterized by the presence of sterile vegetations on a cardiac valve. We present a case of multi-territory stroke caused by embolism of a non-bacterial thrombotic aortic valve endocarditis, leading to the diagnosis of a prostate adenocarcinoma with bone metastases.

Case summary

A 66-year-old patient was diagnosed with pulmonary embolism, first attributed to an asymptomatic coronavirus disease 2019 infection. Edoxaban was started, which was discontinued by the patient. Four weeks later, he presented with subacute vertigo and balance disorders. Magnetic resonance imaging showed a multi-territory stroke. A transoesophageal echocardiogram demonstrated a small vegetation on the aortic valve with moderate aortic insufficiency. Blood cultures remained negative. Malignancy screening showed a markedly elevated prostate-specific antigen. Prostate adenocarcinoma was confirmed on biopsy. A positron emission tomography revealed metastatic disease. A diagnosis of non-bacterial thrombotic endocarditis and paraneoplastic pulmonary embolism secondary to prostate cancer was made. Edoxaban was restarted and the patient was referred for treatment of the prostate adenocarcinoma. Follow-up after 5 months showed no evidence of aortic valve vegetations.

Discussion

Coronavirus disease 2019 in ambulatory patients may be insufficient as a predisposing factor for venous thrombo-embolism and these patients, especially the elderly, should undergo a screening for malignancy. Non-bacterial thrombotic endocarditis is a rare cause of multi-territory stroke. When related to cancer, the prostate can be the primary tumour.

Incidental Finding of Bilateral Acute Pulmonary Emboli in a Patient With Asymptomatic COVID-19 Infection

A 58-year-old male with a history of hypertension, dyslipidemia, osteoarthritis of both knees, and morbid obesity presented to the emergency department for opioid detoxification. He complained of generalized soreness, anxiety, and difficulty sleeping but denied signs and symptoms suggestive of coronavirus disease 2019 (COVID-19) infection. His COVID-19 polymerase chain reaction (PCR) result came back positive, and his D-dimer level was 5373 ng/mL. A computed tomography pulmonary angiogram showed a moderate burden of bilateral acute pulmonary emboli. He was managed with enoxaparin sodium subcutaneous therapeutic dose for three days, followed by oral apixaban 10 mg twice a day for seven days and then 5 mg twice a day for six months. To date, the rate of venous thromboembolism (VTE) in nonhospitalized patients with COVID-19 has not been reported, and current guidelines do not recommend thromboprophylaxis for these patients.