Lingual thyroid: diagnosis using a hybrid of single photon emission computed tomography and standard computed tomography.
OBJECTIVE
To present a rare case of lingual thyroid detected using a hybrid of single photon emission computed tomography and standard computed tomography in a young woman with hypothyroidism.


METHODS
A 29-year-old woman was screened for autoimmune thyroid disorders in early pregnancy, and found to have subclinical hypothyroidism. No thyroid tissue was found in the anterior neck upon ultrasonography, raising suspicions of an ectopic thyroid. The patient was treated with levothyroxine throughout the remainder of her pregnancy, and developed postpartum thyroiditis requiring an increase in levothyroxine dosage. Whole-body scintigraphy and zoomed static head and neck scintigraphy were performed. Abnormal 99mTc-pertechnetate uptake was observed in the oral region, whereas no uptake was found in the usual thyroid location. Hybrid imaging using single photon emission computed tomography and standard computed tomography was performed to improve three-dimensional representation of the area of increased activity.


RESULTS
The latter imaging modality detected ectopic thyroid tissue in the tongue.


CONCLUSIONS
Whole body 99mTc-pertechnetate scintigraphy and a hybrid of single photon emission computed tomography and standard computed tomography are effective imaging modalities for the investigation of ectopic thyroid tissue. The latter modality is particularly recommended, as it allows more precise spatial visualisation of increased isotope uptake activity in the head and neck.
Department of Nuclear Medicine, Charles University in Praque, Faculty of Medicine in Hradec Kralove and Charles University Teaching Hospital, Hradec, Kralove, Czech Republic. dolezal@fnhk.cz
J
J
Dolezal
J
J
Vizda
J
J
Horacek
S
S
Spitalnikova
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007037:Hypothyroidism / Q000175:diagnosis* / Q000000981:diagnostic imaging; D046151:Lingual Thyroid / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D050033:Thyroid Dysgenesis; D013961:Thyroid Gland; D014055:Tomography, Emission-Computed; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed; D055815:Young Adult