Large volume right pneumothorax with mild left mediastinal shift likely secondary to a ruptured subpleural bleb.
Diffuse thin-walled cystic lung disease. Given the patient demographic this may represent lymphangioleiomyomatosis (LAM).

Hacking C, Pneumothorax due to lymphangioleiomyomatosis. Case study, Radiopaedia.org (Accessed on 30 Aug 2024) https://doi.org/10.53347/rID-92539