Because the detection rate of occult pneumothoraces in a delayed fashion is low, these are often published
as case reports [30–37].
One large retrospective study of 9637 outpatients with cancer receiving subclavian lines for chemotherapy found
a low incidence of delayed pneumothorax (0.4%; 95% CI, 0.3%-0.5%)
[38].
Patients in this series had been reimaged because of persistent or worsening symptoms or 24 hours after an unsuccessful insertion when a new central line was placed in the opposite subclavian vein