Here is an other (older) example of the usefulness of PET scans in this case report in 2000:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11029791&dopt=Abstract
Lymph node metastasis from breast cancer diagnosed by F-18 FDG whole-body PET (case report).
Nowdays, I assume a combined PET/CT scan would provide an even more accurate diagnostic.
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