Variable expressivity in Patau syndrome is not all related to trisomy 13 mosaicism.

Patau syndrome (trisomy 13) is very rare in live-born babies. Individuals with this chromosomal syndrome have a short lifespan and are rarely seen beyond infancy. This study is aimed at the clinical spectrum, natural history, and survival of patients with trisomy 13.

Catheter-related superior vena cava syndrome complicated by chylothorax in a premature infant.

A premature infant experienced respiratory distress due to chylothorax. Contrast-enhanced chest computed tomography showed superior vena cava (SVC) obstruction with collaterals, and surgery confirmed an obstruction of the SVC by intravascular fibrotic tissue and thrombi caused by placement of a central venous catheter. The respiratory distress improved after surgical intervention.