It is debatable whether treatment of thyroid nodules with thyroid horm
ones is effective, results of clinical trials, even randomized, being
inconclusive, none of them showing significant efficacy of this therap
y. Two questions remain unanswered: what is the natural history of the
se nodules and is it possible to identify patients with these heteroge
neous lesions who will respond to treatment? Currently available study
data show a marked level of spontaneous regression or even total disa
ppearance of the nodules. Further long-term clinical trials appear ind
icated, including a sufficient number of patients and a large cohort o
f untreated patients.