Cases reported "Thyroid Nodule"

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1/28. De Quervain's subacute thyroiditis presenting as a painless solitary thyroid nodule.

    We describe a 39-year-old woman presenting with a painless solitary thyroid nodule, initially without signs suggesting thyroiditis. The serum level of thyrotropin was suppressed whereas those of thyroxine and triiodothyronine were normal. Fine needle aspiration cytology showed no signs of inflammation or malignancy. One week later, the patient felt pain and tenderness on her neck, and erythrocyte sedimentation rate and c-reactive protein were markedly elevated. Thyroid scintigraphy showed a suppressed thyroid pertechnetate uptake. At that time, the diagnosis of subacute thyroiditis was made. Upon treatment with steroids the patient's symptoms as well as the thyroid nodule resolved. This case illustrates that subacute thyroiditis de Quervain may present as a solitary, painless nodule with suppressed thyrotropin and should therefore be considered in the differential diagnosis of such lesions.
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2/28. Pediatric hemorrhagic thyroid nodule: a case report.

    Hemorrhagic thyroid nodules are rare in the pediatric age group. They present as rapidly enlarging neck masses. Diagnostic modalities available are laboratory evaluation, ultrasound, radionuclide imaging, and fine needle aspiration. Depending on the pattern of growth of the lesion, one may observe or proceed with surgery. A rapidly enlarging thyroid mass raises the suspicion of malignancy, and hemorrhagic nodules, though rare, must be considered in the differential diagnosis.
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3/28. Intrathyroid thyroglossal duct cyst simulating a thyroid nodule.

    A case of intrathyroid thyroglossal duct cyst is reported. A 50-year-old woman presented with a right lateral neck mass that was clinically indistinguishable from a thyroid nodule. Ultrasound-guided fine-needle aspiration biopsy (US-FNAB) revealed normal-looking squamous cells. Right thyroid lobectomy was performed and microscopic examination revealed a cyst lined by squamous epithelium that was consistent with a thyroglossal duct cyst. The lesion was completely surrounded by normal thyroid tissue. Our experience suggests that intrathyroid thyroglossal duct cyst should be remembered in the differential diagnosis of a thyroid nodule. Detection of benign squamous cells by US-FNAB may be useful for ruling out the possibility of a cystic thyroid tumor.
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4/28. Unusual presentation of tuberculosis reactivation in childhood: an anterior neck mass.

    Although extrapulmonary tuberculosis has a broad spectrum of clinical manifestations, involvement of the thyroid gland in children has been reported very rarely. The authors report a case of an 11-year-old girl with a nontender nodular swelling of the thyroid, whose symptoms, tomographic and scintigraphic features, mimicked a nodule with a cystic component. Although seldom observed, tuberculosis should be considered in the differential diagnosis of nodular lesions of the thyroid in children, especially in the patient with known history of exposure to tuberculosis.
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5/28. Papillary thyroid carcinoma associated with parathyroid adenoma detected by pertechnetate-MIBI subtraction scintigraphy.

    Two cases of papillary thyroid carcinoma coexisting with a parathyroid adenoma are reported. A double-tracer pertechnetate-MIBI subtraction scan combined with neck ultrasound correctly visualized the site of the parathyroid adenoma despite the presence of thyroid nodule(s) located in the opposite thyroid lobe in one case and in both thyroid lobes in the other case. In both patients, the papillary thyroid carcinoma was cold with Tc-99m pertechnetate and hot with MIBI. Total thyroidectomy and parathyroidectomy of a solitary parathyroid adenoma were performed in both patients. Pertechnetate-MIBI subtraction scanning associated with neck ultrasound appears to be a useful imaging technique to detect parathyroid adenoma before operation in patients with concomitant thyroid nodular disease. A MIBI-hot and Tc-99m pertechnetate-cold thyroid nodule can indicate the possible presence of a malignant lesion.
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6/28. Riedel's thyroiditis: clinical, pathological and imaging features.

    Riedel's thyroiditis (RT) is an extremely rare form of chronic thyroiditis, characterised by a fibroinflammatory process which partially destroys the thyroid, often involving surrounding tissues. We describe an unusual case of RT in a 38-year-old woman, and discuss its typical clinical, pathological, ultrasound, radionuclide scanning and magnetic resonance findings. We conclude that the diagnosis of RT is highly suggestive in the presence of a hard gland (or nodule), fixed to adjacent structures; 'cold' on Tc99 scan; hypoechoic with absence of vascular flow, invading the adjacent neck structures on ultrasound; hypointense in T1- and T2-weighted MR images; and showing fibrous tissue fragments with inflammatory cells at cytological examination. Thyroidectomy has to be performed to confirm the diagnosis and to relieve pressure symptoms.
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7/28. Incidentally found pharyngoesophageal diverticulum on ultrasonography.

    The pharyngoesophageal diverticulum in the lower part of the neck can be detected using neck ultrasonography. We present a case of pharyngoesophageal diverticulum mimicking a thyroid nodule, which was found incidentally by ultrasonography, and discuss its peculiar findings, which might be useful to diagnose pharyngoesophageal diverticulum and to prevent invasive procedures such as needle aspiration biopsy.
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8/28. Hashimoto's thyroiditis presenting as single hot nodule and hypothyroidism.

    Radionuclide thyroid scanning of patients with Hashimoto's thyroiditis (HT) may mimic other thyroid disorders including cold nodules, multinodular goiter and rarely hot nodules. The association of single hot nodules in such patients in the face of primary hypothyroidism has not been previously reported. We describe 6 female patients with HT who presented either with symptoms of overt thyroid failure or a sensation of lump in the neck (and later found to have mild thyroid failure) who had single firm thyroid nodules. These nodules were hot by both 99mTc pertechnetate and radioiodine thyroid scans. In three of 4 patients followed up for longer than 6 months on adequate thyroid replacement therapy the nodules regressed by up to 60%. Given "Best practice" recommendations patients with thyroid failure and single thyroid nodules would not be submitted to radionuclide scanning and this presentation of HT would have gone undetected.
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9/28. Benign cervical thymoma masquerading as a malignant thyroid nodule.

    A thymoma in the neck region is a rare diagnosis involving a solitary neck nodule that moves with deglutition and is contiguous with the thyroid gland. The authors report an unusual case of a thymoma that accumulated both Tc-99m pertechnetate and Tc-99m MIBI. This is probably the first reported case of a benign neck thymoma concentrating these two radiopharmaceuticals. thymoma should be added to the gamut of false-positive findings in the neck for thyroidal (with Tc-99m pertechnetate) and malignant (with Tc-99m MIBI) tissue.
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10/28. Intra-thyroid thyroglossal duct cyst as a differential diagnosis of thyroid nodule.

    An intra-thyroid thyroglossal duct cyst (ITTDC) presented as a congenital anterior neck mass in a 10-year-old male. diagnosis, work-up, management approach, and differential diagnosis of thyroid nodules are discussed, as well as distinguishing features between thyroglossal duct cyst (TDC) and branchial cleft cyst (BCC). This is the fourth case of ITTDC reported in the pediatric population, and ITTDC should remain in the differential diagnosis of pediatric neck mass.
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