Hypoglycemia CT: Difference between revisions
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== Overview == | == Overview == | ||
[[Computed tomography|CT scan]] can be used for diagnosing [[insulinoma]] and islet-cell [[hypertrophy]]. Currently, with the advances in technology. The [[Sensitivity (tests)|sensitivity]] has risen to 80% and 94.4% for [[helical CT scan]] with dual-phase multidetector [[Computed tomography|CT scan]]. [[Insulinoma]] is hypervascular and [[Computed tomography|CT]] shows greater enhancement than rest of the pancreatic [[parenchyma]]. It can appear hypovascular and hypodense lesions after the administration of contrast. | |||
== CT == | == CT == | ||
Abdominal CT scan may be helpful in diagnosis of [[insulinoma]] and islet-cell [[hypertrophy]]. | |||
* Ultrasound, Computed tomography and MRI can differentiate between both.<ref name="pmid15763695">{{cite journal| author=Noone TC, Hosey J, Firat Z, Semelka RC| title=Imaging and localization of islet-cell tumours of the pancreas on CT and MRI. | journal=Best Pract Res Clin Endocrinol Metab | year= 2005 | volume= 19 | issue= 2 | pages= 195-211 | pmid=15763695 | doi=10.1016/j.beem.2004.11.013 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15763695 }}</ref> | * [[Ultrasound]], [[Computed tomography|computed tomography,]] and [[Magnetic resonance imaging|MRI]] can differentiate between both.<ref name="pmid15763695">{{cite journal| author=Noone TC, Hosey J, Firat Z, Semelka RC| title=Imaging and localization of islet-cell tumours of the pancreas on CT and MRI. | journal=Best Pract Res Clin Endocrinol Metab | year= 2005 | volume= 19 | issue= 2 | pages= 195-211 | pmid=15763695 | doi=10.1016/j.beem.2004.11.013 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15763695 }}</ref> | ||
* A negative imaging study does not exclude insulinoma and patient | * The [[Sensitivity (tests)|sensitivity]] of [[Computed tomography|CT scan]] for diagnosing [[insulinoma]] has increased to 80%.<sup>[[Insulinoma CT#cite note-pmid23430217-1|[1]]]</sup> | ||
[[ | * A negative imaging study does not exclude [[insulinoma]] and patient need more tests.<ref name="pmid157636952">{{cite journal| author=Noone TC, Hosey J, Firat Z, Semelka RC| title=Imaging and localization of islet-cell tumours of the pancreas on CT and MRI. | journal=Best Pract Res Clin Endocrinol Metab | year= 2005 | volume= 19 | issue= 2 | pages= 195-211 | pmid=15763695 | doi=10.1016/j.beem.2004.11.013 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15763695 }}</ref> | ||
CT showing insulinoma | * Findings on [[Computed tomography|CT scan]] suggestive of [[insulinoma]] include:<sup>[[Insulinoma CT#cite note-pmid23430217-1|[1]]]</sup> | ||
Case courtesy of Dr | **[[Computed tomography|CT]] shows hyperdensity in arterial phase so arterial or [[pancreatic]] phase imaging may aid in better detection. Some may show [[calcification]].<ref name="pmid9534694">{{cite journal| author=King AD, Ko GT, Yeung VT, Chow CC, Griffith J, Cockram CS| title=Dual phase spiral CT in the detection of small insulinomas of the pancreas. | journal=Br J Radiol | year= 1998 | volume= 71 | issue= 841 | pages= 20-3 | pmid=9534694 | doi=10.1259/bjr.71.841.9534694 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=9534694 }}</ref> | ||
**Greater degree of enhancement than [[parenchyma]] of the rest of [[pancreas]] (as its hypervascular) during the vascular phases of the contrast.<ref name="pmid16498592">{{cite journal| author=Tucker ON, Crotty PL, Conlon KC| title=The management of insulinoma. | journal=Br J Surg | year= 2006 | volume= 93 | issue= 3 | pages= 264-75 | pmid=16498592 | doi=10.1002/bjs.5280 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16498592 }}</ref> | |||
**Most [[Insulinoma|insulinomas]] are smaller, <1.3 cm and many of these are non-contour forming. Therefore, [[Computed tomography|CT scan]] is less effective in diagnosing them than MRI.<sup>[[Insulinoma CT#cite note-pmid16179163-2|[2]]][[Insulinoma CT#cite note-pmid15763695-3|[3]]]</sup> | |||
**It can appear hypovascular and hypodense lesions after the administration of contrast.<ref name="pmid16179163">{{cite journal| author=McAuley G, Delaney H, Colville J, Lyburn I, Worsley D, Govender P et al.| title=Multimodality preoperative imaging of pancreatic insulinomas. | journal=Clin Radiol | year= 2005 | volume= 60 | issue= 10 | pages= 1039-50 | pmid=16179163 | doi=10.1016/j.crad.2005.06.005 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16179163 }}</ref> | |||
[[File:Insulinoma CT gif.gif|center|500px|thumb|CT showing insulinoma, source: Case courtesy of Dr J. Ray Ballinger, Radiopaedia.org, rID: 23627]] | |||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
Latest revision as of 15:53, 16 November 2017
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Hypoglycemia Microchapters |
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Hypoglycemia CT On the Web |
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American Roentgen Ray Society Images of Hypoglycemia CT |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Mohammed Abdelwahed M.D[2]
Overview
CT scan can be used for diagnosing insulinoma and islet-cell hypertrophy. Currently, with the advances in technology. The sensitivity has risen to 80% and 94.4% for helical CT scan with dual-phase multidetector CT scan. Insulinoma is hypervascular and CT shows greater enhancement than rest of the pancreatic parenchyma. It can appear hypovascular and hypodense lesions after the administration of contrast.
CT
Abdominal CT scan may be helpful in diagnosis of insulinoma and islet-cell hypertrophy.
- Ultrasound, computed tomography, and MRI can differentiate between both.[1]
- The sensitivity of CT scan for diagnosing insulinoma has increased to 80%.[1]
- A negative imaging study does not exclude insulinoma and patient need more tests.[2]
- Findings on CT scan suggestive of insulinoma include:[1]
- CT shows hyperdensity in arterial phase so arterial or pancreatic phase imaging may aid in better detection. Some may show calcification.[3]
- Greater degree of enhancement than parenchyma of the rest of pancreas (as its hypervascular) during the vascular phases of the contrast.[4]
- Most insulinomas are smaller, <1.3 cm and many of these are non-contour forming. Therefore, CT scan is less effective in diagnosing them than MRI.[2][3]
- It can appear hypovascular and hypodense lesions after the administration of contrast.[5]
References
- ↑ Noone TC, Hosey J, Firat Z, Semelka RC (2005). "Imaging and localization of islet-cell tumours of the pancreas on CT and MRI". Best Pract Res Clin Endocrinol Metab. 19 (2): 195–211. doi:10.1016/j.beem.2004.11.013. PMID 15763695.
- ↑ Noone TC, Hosey J, Firat Z, Semelka RC (2005). "Imaging and localization of islet-cell tumours of the pancreas on CT and MRI". Best Pract Res Clin Endocrinol Metab. 19 (2): 195–211. doi:10.1016/j.beem.2004.11.013. PMID 15763695.
- ↑ King AD, Ko GT, Yeung VT, Chow CC, Griffith J, Cockram CS (1998). "Dual phase spiral CT in the detection of small insulinomas of the pancreas". Br J Radiol. 71 (841): 20–3. doi:10.1259/bjr.71.841.9534694. PMID 9534694.
- ↑ Tucker ON, Crotty PL, Conlon KC (2006). "The management of insulinoma". Br J Surg. 93 (3): 264–75. doi:10.1002/bjs.5280. PMID 16498592.
- ↑ McAuley G, Delaney H, Colville J, Lyburn I, Worsley D, Govender P; et al. (2005). "Multimodality preoperative imaging of pancreatic insulinomas". Clin Radiol. 60 (10): 1039–50. doi:10.1016/j.crad.2005.06.005. PMID 16179163.