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Hypoplasia of the inferior vena cava and deep vein thrombosis.

### Learning Point for Clinicians

Hypoplasia of the inferior vena cava (IVC) has been described mainly as an incidental finding associated with a number of congenital malformations; it should be taken into account when otherwise unexplained deep vein thrombosis (DVT) develops in young people; tips for diagnosis are the presence of extensive and bilateral iliac thrombosis and an enlarged shadow of the azygos vein on chest X-rays, computed tomography (CT) and magnetic resonance imaging (MRI).

A 61-year-old man presented with spontaneous bilateral ilio-femoral DVT and dyspnea. His past medical history was unremarkable, and there was no familial history for venous …