Incidental medical findings

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Incidental medical findings are previously undiagnosed medical or psychiatric conditions that are discovered unintentionally and during evaluation for a medical or psychiatric condition. Such findings may occur in a variety of settings, including routine medical care, during biomedical research, [1] during post-mortem autopsy, [2] or during genetic testing. [3]

Contents

A report by the Presidential Commission for the Study of Bioethical Issues on incidental findings Anticipate and Communicate - Ethical Management of Incidental and Secondary Findings.pdf
A report by the Presidential Commission for the Study of Bioethical Issues on incidental findings

Medical imaging

An incidentaloma is a tumor found by coincidence which is often benign and does not cause any clinically significant symptoms; however a small percentage do turn out to be malignant. Incidentalomas are common, with up to 7% of all patients over 60 harboring a benign growth,[ citation needed ] often of the adrenal gland, which is detected when diagnostic imaging is used for the analysis of unrelated symptoms.

As 37% of patients receiving whole-body CT scan may have abnormal findings that need further evaluation and with the increase of "whole-body CT scanning" as part of health screening programs, the chance of finding incidentalomas is expected to increase. [5]

Neuroimaging

Incidental findings in neuroimaging are common, with the prevalence of neoplastic incidental brain findings increasing with age. [6] Even in healthy subjects acting as controls in research incidental findings are not rare. [7] As most neuroimaging studies are performed in adults, less is known about the prevalence incidental findings in children. [8] A study in 2017 in nearly 4000 children between 8 and 12 reported that approximately 1 in 200 children showed asymptomatic incidental findings that required clinical follow-up. [9]

Pituitary adenomas are tumors that occur in the pituitary gland, and account for about 15% of intracranial neoplasms. They often remain undiagnosed, and are often an incidental finding during autopsy. Microadenomas (<10mm) have an estimated prevalence of 16.7% (14.4% in autopsy studies and 22.5% in radiologic studies). [10] [11]

Genetic testing

Unintentional genetic findings (aka "incidentalomes" [12] ) are more commonly encountered with the advent of biomedical technologies capable of quickly and reliably performing genomic analysis, such as whole-genome sequencing. As with medical imaging, the capacity to measure biologic information in the form of genetic variation may exceed the scientific understanding of what the findings mean.

In 2013, the American College of Medical Genetics and Genomic Working Group on Incidental Findings published preliminary guidelines for clinical laboratories that perform clinical exome and genome sequencing. They outlined a list of "medically actionable" pathogenic gene mutations, mostly monogenetic or single-gene disorders, which were significantly associated with important medical diagnoses and which should be reported to the patient "regardless of the proband’s phenotype or age". [13]

References

  1. Wolf S.M.; Paradise J.; Caga-anan C. (2008). "The Law of Incidental Findings in Human Subjects Research". Journal of Law, Medicine & Ethics. 36 (2): 361–383. doi:10.1111/j.1748-720X.2008.00281.x. PMC   2581517 . PMID   18547206.
  2. Light TD, Royer NA, Zabell J, et al. (2011). "Autopsy after traumatic death--a shifting paradigm". J Surg Res. 167 (1): 121–4. doi:10.1016/j.jss.2009.07.009. PMC   2891351 . PMID   20031159.
  3. Clayton EW (2008). "Incidental findings in genetics research using archived DNA". J Law Med Ethics. 36 (2): 286–91. doi:10.1111/j.1748-720X.2008.00271.x. PMC   2576744 . PMID   18547196.
  4. Couzin-Frankel, Jennifer (2013). "President's Bioethics Panel Weighs in on How U.S. Should Handle Incidental Findings". news.sciencemag.org . Retrieved 13 December 2013.
  5. Furtado CD, Aguirre DA, Sirlin CB, et al. (2005). "Whole-body CT screening: spectrum of findings and recommendations in 1192 patients". Radiology. 237 (2): 385–94. doi:10.1148/radiol.2372041741. PMID   16170016.
  6. Ladd SC, Warlow C, Wardlaw JM, et al. (Aug 2009). "Incidental findings on brain magnetic resonance imaging: systematic review and meta-analysis". BMJ. 339: b3016. doi:10.1136/bmj.b3016. PMC   2728201 . PMID   19687093.
  7. Cramer SC, Wu J, Hanson JA, et al. (Apr 2011). "A system for addressing incidental findings in neuroimaging research". NeuroImage. 55 (3): 1020–3. doi:10.1016/j.neuroimage.2010.11.091. PMC   3057347 . PMID   21224007.
  8. Maher CO, Piatt JH (Apr 2015). "Incidental findings on brain and spine imaging in children". Pediatrics. 135 (4): e1084 –e1096. doi: 10.1542/peds.2015-0071 . PMID   25825535. S2CID   1640089.
  9. Jansen PR, van der Lugt A, White T (Oct 2017). "Incidental Findings on Brain Imaging in the General Pediatric Population". New England Journal of Medicine. 377 (16): 1593–1595. doi:10.1056/NEJMc1710724. hdl: 1887/92310 . PMID   29045203.
  10. Ezzat S, Asa SL, Couldwell WT, Barr CE, Dodge WE, Vance ML, McCutcheon IE (August 2004). "The prevalence of pituitary adenomas: a systematic review". Cancer. 101 (3): 613–9. doi: 10.1002/cncr.20412 . PMID   15274075. S2CID   16595581.
  11. Asa SL (August 2008). "Practical pituitary pathology: what does the pathologist need to know?" . Arch. Pathol. Lab. Med. 132 (8): 1231–40. doi:10.5858/2008-132-1231-PPPWDT. PMID   18684022 . Retrieved 2008-09-03.[ dead link ]
  12. Kohane, Isaac S.; Masys, Daniel R.; Altman, Russ B. (2006-07-12). "The Incidentalome". JAMA. 296 (2): 212–5. doi:10.1001/jama.296.2.212. ISSN   0098-7484. PMID   16835427. S2CID   2063402.
  13. Green, Robert C.; Berg, Jonathan S.; Grody, Wayne W.; Kalia, Sarah S.; Korf, Bruce R.; Martin, Christa L.; McGuire, Amy L.; Nussbaum, Robert L.; O’Daniel, Julianne M. (July 2013). "ACMG recommendations for reporting of incidental findings in clinical exome and genome sequencing". Genetics in Medicine. 15 (7): 565–574. doi:10.1038/gim.2013.73. ISSN   1530-0366. PMC   3727274 . PMID   23788249.