Transient Hyperintensity of the Infant Thyroid Gland on T1-Weighted MR Imaging: Correlation with Postnatal Age, Gestational Age, and Signal Intensity of the Pituitary Gland

Object Preoperative impairment of cerebral hemodynamics predicts the development of new cerebral ischemic events after carotid endarterectomy (CEA), including neurological deficits and cerebral ischemic lesions on diffusion weighted MR imaging. Furthermore, the signal intensity of the middle cerebral artery (MCA) on single-slab 3D time-of-flight MR angiography (MRA) can assess hemodynamic impairment in the cerebral hemisphere. The purpose of the present study was to determine whether, on preoperative MR angiography, the signal intensity of the MCA can be used to identify patients at risk for development of cerebral ischemic events after CEA. Methods The signal intensity of the MCA ipsilateral to CEA on preoperative MR angiography was graded according to the ability to visualize the MCA in 106 patients with unilateral internal carotid artery stenosis (≥ 70%). Diffusion weighted MR imaging was performed within 3 days of and 24 hours after surgery. The presence or absence of new postoperative neurological deficits was also evaluated. Results Cerebral ischemic events after CEA were observed in 16 patients. Reduced signal intensity of the MCA on preoperative MR angiography was the only significant independent predictor of postoperative cerebral ischemic events. When the reduced MCA signal intensity on preoperative MR angiography was defined as an impairment in cerebral hemodynamics, MR angiography grading resulted in an 88% sensitivity and 63% specificity, with a 30% positive- and a 97% negative-predictive value for the development of postoperative cerebral ischemic events. Conclusions Signal intensity of the MCA on preoperative single-slab 3D time-of-flight MR angiography is useful for identifying patients at risk for cerebral ischemic events after CEA.

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MR imaging of ventriculus terminalis of the conus medullaris: A report of two operated patients and review of the literature

Acta Radiologica ◽

10.1080/j.1600-0455.2003.00096.x ◽

2003 ◽

Vol 44 (4) ◽

pp. 444-446

Author(s):

R. Dullerud ◽

A. Server ◽

J. Berg-Johnsen

Keyword(s):

Spinal Cord ◽

Mr Imaging ◽

Signal Intensity ◽

Incidental Finding ◽

Conus Medullaris ◽

Review Of The Literature ◽

Per Se ◽

Specific Symptoms ◽

Work Up

We report on 2 patients in whom a cystic dilation of the conus medullaris was incidentally found at MR imaging carried out in the work-up for sciatica. The cysts were well circumscribed and had signal intensity identical to the CSF on both T1- and T2-weighted images. There was no evidence of contrast enhancement. None of the patients had specific symptoms related to the spinal cord. At surgery, no evidence of malignancy was seen in any of the patients. A benign cystic dilation, also called dilated ventriculus terminalis, occasionally can be seen in the conus medullaris as an incidental finding at thoracolumbar MR imaging. Unless the expansion per se indicates cyst drainage, these patients may be monitored by clinical and MR follow-up, avoiding surgery in a substantial number of cases.

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Uterine Artery Embolization for Symptomatic Fibroids with High Signal Intensity on T2-Weighted MR Imaging

Korean Journal of Radiology ◽

10.3348/kjr.2012.13.5.618 ◽

2012 ◽

Vol 13 (5) ◽

pp. 618 ◽

Cited By ~ 8

Author(s):

Suyon Chang ◽

Man-Deuk Kim ◽

Myungsu Lee ◽

Mu Sook Lee ◽

Sung Il Park ◽

...

Keyword(s):

Mr Imaging ◽

Signal Intensity ◽

Uterine Artery Embolization ◽

Uterine Artery ◽

High Signal Intensity ◽

High Signal ◽

Artery Embolization

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Iodine and iodothyronine content in human neonate thyroid gland

Archives of Biological Sciences ◽

10.2298/abs0204069s ◽

2002 ◽

Vol 54 (3-4) ◽

pp. 69-74 ◽

Cited By ~ 1

Author(s):

Svetlana Savin-Zegarac ◽

Dubravka Cvejic ◽

Olgica Nedic ◽

R. Radosavljevic ◽

Ivana Petrovic

Keyword(s):

Thyroid Gland ◽

Gestational Age ◽

Thyroid Tissue ◽

Iodine Content ◽

Postnatal Life ◽

Total Iodine ◽

Mean Values ◽

Human Neonate ◽

The Mean ◽

Human Neonates

A few years after the iodine content of salt in Serbia was increased from 7 to 15 mg/kg NaCI, iodine, thyroxine (T4) and triiodothyronine (T3) concentrations were measured in thyroid tissue obtained at autopsy from 21 human neonates who died within 30 days after birth. The thyroidal iodine as well as T4 and T3 content per gland in?creased progressively with gestational age of human neonates (r = 0.73, 0.70 and 0.67 respectively, p < 0.001). In seven newborns (gestational age 36 to 41 weeks) the mean values for total iodine, T4 and T3 per gland were 109.1 ?g, 52.2 ?g and 4.4 ?g respectively. The results of iodine and iodothyroninc content found in neonatal thyroid gland, particularly at the end of gestation and a few days of postnatal life, indicates that the iodine supply was satisfactory.

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