Thoracic endometriosis in an inoperable patient

In this case report, we present a case of a woman in her 30s who was diagnosed with thoracic endometriosis presenting as a large pulmonary mass. Hormonal treatment progestin (synthetic form of progesterone) was started. The patient was deemed technically inoperable due to anatomical constraints. Follow-up CT showed little change in the lesion's size but revealed central cavitation within the lesion due to its connection to a posterobasal bronchus presenting an additional therapeutic dilemma. This case highlights the diagnostic and treatment challenges associated with atypical thoracic masses that mimic malignant tumours particularly in the context of inoperable patients.