Retrospective assessment of ultrasound and clinical characteristics of patients with IDDVT, development of a pulmonary embolism risk prediction model for thrombus, and provision of appropriate diagnostic and therapeutic recommendations.

Inclusion Criteria:

Diagnosis of new-onset IDDVT confirmed by lower limb vascular ultrasound; presence/absence of pulmonary embolism clarified by pulmonary artery CTA; ultrasound and pulmonary artery CTA results spanning no more than 5 days.

Exclusion Criteria:

Anticoagulation therapy in the last month; pregnancy or puerperium; recurrent DVT or PE.

Both male and female