Daisy, I'm curious to know what it was as I had a similar experience with a PETscan. Something lit up in my upper right lobe; went in for a needle biopsy a week and a half later. The contrast CT showed nothing left to biopsy.

dx 2/13/06. modified radical neck dissection 3/9/06 multiple biopsies of upper airway and direct laryngoscopy. 1 of 47 lymph nodes positive for metastatic undifferentiated carcinoma (lymphoepithelioma). Unknown primary. Finished radiation 5/24/06.