CASE PRESENTATION: A 65 year old woman presented with episodes of marked diaphoresis for one year. She had history of a hysterectomy for uterine fibroids 17 years prior. Her medical evaluation was unremarkable save for a chest radiograph which identified a left lower lobe mass. Computed tomography of the chest demonstrated a 4.9 cm low density mass along the left major fissure, consistent with a bronchogenic cyst (Figure 1A-B). Also noted were multiple small nodules, 3-6mm in size. The cyst was resected; its cytology was benign and fluid bacterial culture had no growth. The wall of the cyst demonstrated smooth muscle cells staining positive for actin, desmin, as well as estrogen and progesterone receptors, identical to histopathology from her prior hysterectomy. The cyst was also lined by a single layer of cuboidal epithelial cells staining positive for TTF-1 (Figure 2A-F). After cyst removal, the patient reported complete resolution of her symptoms.