Nuklearmedizin 2006; 45(05): 201-205
DOI: 10.1055/s-0038-1625220
Original Articles
Schattauer GmbH

Thallium-201 scan in evaluating thyroid nodules following equivocal fine-needle aspiration cytology

Thallium-201-Szintigraphie zur Beurteilung von Schilddrüsenknoten bei unklarer Feinnadelaspirationszytologie
J. K. Lee
1   Department of Nuclear Medicine, Chung-Shan Medical University Hospital, Taichung
,
R. S. Liu
2   Taipei Veterans General Hospital, Taipei
,
S. Y. Wu
3   Nuclear Medicine Service, Veterans’ Administration-University of California Irvine Healthcare System, Long Beach, CA, USA
,
W. S. Huang
4   Tri-Service General Hospital, Taipei, Taiwan
,
M. C. Chou
5   Department of Surgery, Chung-Shan Medical University Hospital, Taichung
› Institutsangaben
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Publikationsverlauf

Received: 09. Januar 2006

in revised form: 24. April 2006

Publikationsdatum:
10. Januar 2018 (online)

Summary:

The aim of this prospective study was to evaluate the usefulness of the thallium-201 (201Tl) thyroid scan in the detection of malignancy in cold thyroid nodules whose status was equivocal following palpation fine-needle aspiration cytology (FNAC). Patients, methods: Fifty-one patients with clinically palpable solitary cold thyroid nodules classified as non-diagnostic or suspicious following biopsy underwent 201Tl thyroid scans. Each scan was performed 15 min (early scan) and 3 h (delayed scan) after an intravenous administration of 74 MBq 201Tl. Thallium uptake in the nodules was visually assessed and scored on a three point scale, with a grade of three defining malignancy. All patients underwent surgery and the histopathology of nodule tissues were compared with results of the scans. Results: Fifty-one nodules were examined. Forty were benign and 11 were malignant. For early scans, the diagnostically relevant parameters were: sensitivity (100%), specificity (75%), and accuracy (80%). Corresponding findings for the delayed scan were: 91%, 98%, and 96%. Conclusion: The 201Tl scan is useful for detecting malignancy in cold thyroid nodules classified as nondiagnostic or suspicious lesions by FNAC.

Zusammenfassung:

In dieser prospektiven Studie sollte der Nutzen einer Thallium- 201-(201Tl)-Schilddrüsenszintigraphie zum Nachweis der Malignität von kalten Schilddrüsenknoten, deren Status nach Palpation und Feinnadelaspirationszytologie (FNAC) unklar war, untersucht werden. Patienten, Methodik: Bei 51 Patienten mit klinisch tastbaren, solitären kalten Schilddrüsenknoten, die einen unklaren oder malignitätsverdächtigen feinnadelzytologischen Befund aufwiesen, erfolgte eine 201Tl-Schilddrüsenszintigraphie. Es erfolgten jeweils 15 Minuten (Frühaufnahme) und drei Stunden (Spätaufnahme) nach intravenöser Verabreichung von 74 MBq 201Tl planare Szintigraphien. Die Thalliumaufnahme in die Knoten wurde visuell beurteilt und auf einer Dreipunkteskala bewertet; Grad 3 definierte dabei Malignität. Alle Patienten unterzogen sich einer Operation, der histopathologische Befund des Knotengewebes wurde mit den Ergebnissen der Szintigraphie verglichen. Ergebnisse: 51 Knoten wurden untersucht. 40 waren gutartig, 11 waren bösartig. Bei den Frühszintigraphien waren die diagnostisch relevanten Parameter: Sensitivität (100%), Spezifität (75%) und Genauigkeit (80%). Die entsprechenden Ergebnisse für das Spätszintigramm lagen bei 91%, 98% und 96%. Schlussfolgerung: Die 201Tl-Szintigraphie eignet sich zum Nachweis der Malignität von kalten Schilddrüsenknoten, die anhand der FNAC als nicht diagnostizierbare oder als verdächtige Läsionen klassifiziert werden.

 
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