Relationship of D-dimer and prediction of pulmonary embolism in hospitalized COVID-19 patients: a multicenter study.

COVID-19 is a known risk factor for pulmonary embolism (PE). In this retrospective, multicenter study, we aimed to determine an optimal D-dimer cutoff to predict PE in hospitalized patients with COVID-19. A total of 193 patients underwent computerized tomographic pulmonary angiography imaging and were classified into PE positive and negative groups.

Extragonadal Non-gestational Choriocarcinoma with Tonsillar Presentation.

Extragonadal non-gestational choriocarcinoma is a rare but well-described phenomenon occurring in patients with midline germ cell tumors. Choriocarcinoma (ChC) is an aggressive neoplasm usually developing in women as a rare complication of pregnancy. In male patients ChC occurs in the testes, usually as a component of mixed germ cell tumors.

Changes in lung composition and regional perfusion and tissue distribution in patients with ARDS.

Background And Objective: ARDS is characterized by bilateral pulmonary infiltrates and refractory hypoxemia attributed to V/Q mismatch. We used dynamic CT to characterize changes in lung composition, regional perfusion and tissue distribution in patients with ARDS in comparison with healthy subjects.

Methods: The Fick principle was applied to serial attenuation measurements constructed from sequential CT images acquired during the passage of a bolus of iodinated contrast medium in healthy subjects (n=3) and patients with ARDS (n=11).

Regional pulmonary blood flow in humans and dogs by 4D computed tomography.

Rationale And Objectives: Pulmonary vascular control mechanisms are complex and likely to differ between species. We wish to quantify regional perfusion and the effects of gravity using computed tomography.

Materials And Methods: Sequential density measurements following the administration of a bolus of iodinated contrast medium were acquired from four healthy human subjects and four dogs.