Computed tomography findings in clinically normal and abnormal thyroid patients

Arger, Peter H.; Jennings, Andrew T.; Gordon, Leonard F.; Coleman, Beverly G.; Axel, Leon; Kressel, Herbert Y.; Baron, Richard L.

doi:10.1016/0149-936x(85)90004-9

Cited by 19 publications

(26 citation statements)

References 9 publications

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“…The precontrast attenuation value of 107.5 HU is slightly lower than the reported value in cats (123.2 HU) and is within the reported range in people (70–120 HU) 5–10 . In people the thyroid attenuation value relates linearly to the iodine content of the thyroid follicles 5,7–9,20–22 . An identical explanation can be assumed in dogs.…”

Section: Discussionsupporting

confidence: 61%

“…An identical explanation can be assumed in dogs. The reference values reported here and elsewhere should however not be interpreted strictly, as alimentary iodine intake differences due to different food composition, tap water iodine concentration and geographic differences alter the attenuation values significantly 8,23 . No correlation was found between attenuation value and age, or between attenuation value and weight.…”

Section: Discussionmentioning

confidence: 53%

“…On computed tomography (CT), both human and feline thyroid glands have been described as hyperattenuating structures relative to the surrounding soft tissues. The precontrast attenuation value ranges from approximately 70 to 120 Hounsfield Units (HU) in humans and has a mean of 123 HU in cats 5–10 …”

Section: Introductionmentioning

confidence: 99%

“…CT is able to define the local invasiveness of the tumor and at the same time for detection of metastasis to lymph nodes and lungs 5,7,9,11–15 . CT is also used to detect intrathoracic ectopic thyroid tissue and can provide diagnostic information regarding the different types of human thyroiditis, as CT attenuation values permit estimation of the functional status of the gland 5,7,8,10,11,13,14,16 . Similar information regarding tumor staging and diagnosis of acquired hypothyroidism may be found in dogs and, thus, it is important to know the normal CT features of the thyroid gland in this species.…”

Section: Introductionmentioning

confidence: 99%

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Computed Tomographic Features of the Normal Canine Thyroid Gland

Taeymans

Schwarz

Duchateau

et al. 2008

Vet Radiology Ultrasound

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The computed tomographic (CT) features of the normal thyroid gland were compiled from images acquired in 25 client-owned dogs without thyroid gland disease. The mean pre- and postcontrast attenuation values were 107.5 and 169.0 Hounsfield Units, respectively. After injection of intravenous contrast medium (600 mg iodine/kg), the apparent thyroid gland volume (both lobes combined) increased from a mean value of 1148.0 nm3 to a mean value of 1188.9 mm3. All thyroid lobes were homogeneous on pre- and postcontrast images. In a craniocaudal direction, the gland spanned a region from the 1st to the 8th tracheal ring and the right lobe was often more cranial than the left. On transverse images the lobe shape was ovoid in 72%, and its location was dorsolateral to the trachea in 90% of dogs. Parathyroid glands could not be identified and an isthmus connecting both thyroid lobes was only seen in one dog. Considering the excellent visibility of the normal canine thyroid gland, CT can be beneficial in the differentiation of thyroidal versus nonthyroidal neck masses. CT also yields potential in the staging of thyroid carcinomas.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computed Tomographic Features of the Normal Canine Thyroid Gland

Taeymans

Schwarz

Duchateau

et al. 2008

Vet Radiology Ultrasound

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“…In this study and the study by Taeymans et al (), tumour attenuation values were lower than normal thyroid attenuation values (Taeymans et al ). This is likely due to differences in metabolism and storage of iodine between tumour and normal tissue (Silverman et al , Arger et al , Verschueren et al , Imanishi et al ). In addition, all four hyperthyroid dogs had hypoattenuating tumours compared with normal thyroid (Taeymans et al ).…”

Section: Discussionmentioning

confidence: 99%

Computed tomographic appearance of canine thyroid tumours

Gilmour

Wilke

Riedesel

2014

J of Small Animal Practice

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Parasellar syndromes

Johnston¹

2002

Curr Neurol Neurosci Rep

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The parasellar compartments are located lateral to and on either side of the sella turcica. The cavernous sinuses are the most prominent anatomic feature of the parasella. Each sinus consists of a plexus of veins through which runs the intracavernous portion of the internal carotid artery. Ocular motor nerves three and four travel within the dural covering of the cavernous sinus to the superior orbital fissure, and cranial nerve six travels through the carotid sinus itself, giving rise to parasellar syndromes, which have distinctive clinical features. Ophthalmoplegia occurs as a result of damage to these ocular motor nerves and variable involvement of oculosympathetic nerves. Facial pain, dysesthesia, and paraesthesia are caused by damage to one or more of the divisions of the fifth cranial nerve, travelling in the dural wall of the cavernous sinus. Tumors, such as meningiomas, frequently cause parasellar syndromes, as do aneurysms of the intracavernous portion of the internal carotid artery, carotid-cavernous fistulas, and cavernous sinus thrombosis. Inflammatory conditions such as Tolosa-Hunt syndrome, ischemia to small vessels supplying the cavernous portion of the cranial nerves, and infections can cause this syndrome. Magnetic resonance imaging is the investigation of choice and therapy is specific to the cause of the parasellar syndrome, but now includes more aggressive endoscopic and microsurgical intervention, and radiosurgery.

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Computed tomography findings in clinically normal and abnormal thyroid patients

Cited by 19 publications

References 9 publications

Computed Tomographic Features of the Normal Canine Thyroid Gland

Computed Tomographic Features of the Normal Canine Thyroid Gland

Computed tomographic appearance of canine thyroid tumours

Parasellar syndromes

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