A case of a very large haemorrhagic pericardial effusion in an adolescent patient with COVID-19 infection.

An otherwise healthy 17-year-old adolescent boy presented with upper respiratory tract symptoms and was diagnosed with coronavirus disease 2019 infection. A haemorrhagic pericardial effusion was found in the transthoracic echocardiography. He was treated with pericardiocentesis, ibuprofen, and hydroxychloroquine. A large pericardial effusion may complicate COVID-19 in children and should be considered in acute decompensation.