RETAINED FOREIGN OBJECTS

Surgical procedures are fraught with risks and when a patient goes into a hospital, they understand they are facing potential risks from anesthesia, possible infections and many may face pneumonia from being inactive after a surgical procedure. Some patients also face problems from poorly executed procedures although one of the things that many people do not think about is the potential of a surgeon forgetting to remove a sponge, needle or other foreign object from their bodies before closing their surgical incisions.

https://www.bluegrassjustice.com/practice-areas/medical-malp...

772 incidents of foreign objects left in patients between 2005 and 2012
Equipment like sponges, towels, needles, instruments, retractors and other small items and fragments of tools have been found in patients

http://www.dailymail.co.uk/news/article-2466049/Almost-800-p...


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Note added at 37 mins (2017-08-06 23:21:05 GMT)
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The medical term for a surgeon leaving a foreign object inside of a patient’s body is URFO (unintended retention or foreign objects) or RSI (retained sponges and instruments). Any object left inside of a patient’s body is capable of causing severe physical damage.

https://www.oklahomalawyer.com/resources/can-sue-foreign-obj...

I have a low confidence level because it's difficult to know without more context. I'm basing my answer on what I found after typing "olvido de cuerpo extraño"

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Altas con código ICD-9-CM por olvido de cuerpo extraño durante la intervención en cualquier campo de diagnóstico secundario por cada 100 altas quirúrgicas.

https://www.seguridaddelpaciente.es/formacion/tutoriales/MSC...

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Note added at 41 mins (2017-08-06 23:25:17 GMT)
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According to the following reference, the preferred term is 'Retained surgical item'.

In the US and the UK, unintended retention of a surgical item in a patient after surgery is a reportable event. Retained surgical item (RSI) is now the preferred term (rather than retained foreign body or object) because foreign bodies can be any object found or left in a patient, e.g., bullets, coins, bottles, and shrapnel. RSI refers specifically to the surgical material (tools, supplies, and equipment) that is used by surgical providers to heal, but when inadvertently left in patients, can cause harm . An RSI is a surgical patient safety problem.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140941/