Elastosonographic evaluation of thyroid nodules in acromegaly.
OBJECTIVE
Ultrasound-elastography (US-E) appears to be a helpful tool for the diagnosis of thyroid cancer. In acromegaly, the prevalence of thyroid cancer is still debated. The aims of this study were to evaluate thyroid nodules in acromegaly and to establish the accuracy of US-E in providing information on their nature, using cytological analysis as a reference.


METHODS
US-E was applied to 90 nodules detected in 25 acromegalic patients and to 94 nodules found in 31 non-acromegalic goitrous subjects. The lesions were classified according to the elasticity scores (ES) as soft (ES 1-2) or hard (ES 3-4). Fine needle aspiration cytology could be performed in 60.8% of hard nodules in acromegalics and in 86.7% of hard nodules in controls.


RESULTS
The prevalence of hard nodules was significantly higher in the whole group of acromegalic patients than in controls (56.8 vs 16.0%, P<0.0001). The prevalence of hard nodules in patients with active acromegaly (68.9%) was greater, though not to a statistically significant extent, than that observed in cured (44.4%) and controlled (52.5%) patients. Cytology revealed malignancy or suspect malignancy in four of the nodules of non-acromegalic subjects and in none of the nodules of acromegalic patients.


CONCLUSIONS
This study has demonstrated a high prevalence of stiff thyroid nodules in acromegaly, greater than that found in non-acromegalic goitrous subjects. In acromegalics, hard nodules appeared not to be malignant on cytopathological examination and are probably of fibrous nature. Thus, US-E appears to be of limited value for the diagnosis of thyroid cancer in acromegaly.
Scacchi
Massimo
M
Istituto Auxologico Italiano, University of Milan, Ospedale San Luca IRCCS, Via Spagnoletto 3, 20149 Milan, Italy.
Andrioli
Massimiliano
M
Carzaniga
Chiara
C
Vitale
Giovanni
G
Moro
Mirella
M
Poggi
Luca
L
Pecori Giraldi
Francesca
F
Fatti
Letizia M
LM
Cavagnini
Francesco
F
D000172:Acromegaly / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000473:pathology; D000236:Adenoma / Q000150:complications / Q000473:pathology; D000368:Aged; D044963:Biopsy, Fine-Needle; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D006042:Goiter / Q000473:pathology; D019382:Human Growth Hormone / Q000097:blood; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000032:analysis / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D010911:Pituitary Neoplasms / Q000150:complications / Q000473:pathology; D015203:Reproducibility of Results; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging; D016606:Thyroid Nodule / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000473:pathology
D019382:Human Growth Hormone; D007334:Insulin-Like Growth Factor I