Updated: Aug 26, 2008
Soft tissue foreign bodies are frequently a result of penetrating or abrasive trauma and can result in substantial patient discomfort, deformity, complications involving localized and systemic infection, and further trauma during removal. For information on trauma of all kinds, visit Medscape's Trauma Resource Center.
In most cases, foreign bodies are the result of accidental trauma directly to the soft tissue area of interest; however, other mechanisms such as unwitnessed syncope, potential elder or child abuse, or assault by other persons or personal harm should also be considered.1,2 Patients who present with localized pain after trauma should be questioned about the specific nature of the trauma and examined for an obvious or occult foreign body. Straightforward cases that involve solid, formed, metallic objects obvious on examination, such as nails, staples, and needles, may require less history than the case of an individual with localized pain and foreign body sensation who is unaware of the exact time of onset, sequence of events leading to symptoms, or potential foreign bodies.3
Soft tissue infection caused by foreign bodies can result in additional emergency department (ED) and primary care visits; this is a frequent reason for physician malpractice litigation. Wound care is the subject of 5-20% of lawsuit claims against emergency physicians, and claims about wound care result in 3-11% of award payouts.15 For more information on wound care, visit Medscape's Wound Management Resource Center. For information on malpractice litigation, visit Medscape's Medical Malpractice and Legal Issues Resource Center.
Indications for removal of a foreign body include the following:14
The potential for complications due to the process of removal must be considered. Such complications may include the following:7
Contraindications related to foreign body removal involve the following:3,6
Local anesthesia provides the mainstay in pain control for foreign body removal.
For detailed descriptions of various nerve blocks, please visit the Anesthetic and Analgesic Techniques section of eMedicine’s Clinical Procedures journal.
No single technique is best for the removal of soft tissue foreign bodies.18,19,2,20,21,22,17,23,23,24,25,26 The following principles, however, can guide one’s choice of approach:
Complications involving soft tissue foreign bodies comprise the following:8,11,10,29,15,14
The patient should be informed of the potential for these complications at every step of the way. Document that the patient received this information; adequate documentation may be useful if a poor outcome occurs.15
Radiologic evaluation of soft tissue injuries with potential soft tissue foreign bodies is often an important adjunct in evaluating and planning the potential removal of the foreign body or identifying potential nearby structures, often vascular, that may be damaged during a retrieval procedure.
The following 5 imaging modalities16 are used in foreign body removal:
Radiograph
Radiographs are frequently the first step in foreign body evaluation. They are noninvasive, inexpensive, and can provide positional information, although not in real time, to aid in the removal of the foreign body.17,16,30 Radiographs are most useful with radiopaque foreign bodies and can demonstrate sensitivities above 95% with adequate penetration and multiple views (anteroposterior and lateral).17,16,18 Glass, which is frequently difficult to evaluate and remove, is often radiopaque even if not doped with lead. Plant-based foreign bodies, including bark or needles, plastics, and other polymers, are often radiolucent.17,19,30,18 If appropriate radiolucent surface markers are used prior to the radiograph (ie, 2 surface paperclips, one in the anteroposterior and the other in the lateral plane), positional information of the foreign body relative to the surface markers can be used if a retrieval is planned.20,21
Fluoroscopy has some use in foreign body removal if a C-arm or other appropriate imaging equipment is accessible.20 This technology allows for real-time radiographic visualization of the foreign body and affords the clinician the opportunity to precisely locate the foreign body using skin markers. One clinician described a technique in which, after a local field block, 2 small needles were placed and advanced into the skin at perpendicular angles under fluoroscopy until they were both touching the foreign body. An incision was then made to connect the 2 needles, and dissection (blunt) effected foreign body removal.
CT
CT has an important place as an imaging adjunct in the detection of and removal planning for soft tissue foreign bodies.17,14 CT affords the ability to visualize foreign bodies that are radiolucent on conventional radiographs. It also provides detailed information about local anatomy, tissue reactions, and abscess formation, and it can more effectively demonstrate position and orientation of the foreign body. As such, it is a rich information set for the evaluation and detection of a foreign body and for the planning of the body’s removal.
CT is easily accessible in the emergency department, is more efficient than MRI, and provides substantial information for the resources invested.23 The major drawback of CT may be that, like conventional radiographs and MRI, CT is not a dynamic modality for the emergency physician.
MRI
MRI is not used as frequently during the first clinician visit involving a foreign body. However, MRI can provide detailed information regarding tissue reactions, including chronic inflammatory reactions, osteoblastic or osteolytic changes, and secondary tissue reactions, that can aid in determining the presence and location of an otherwise occult foreign body. As an example of poor performance of MRI in the evaluation of foreign bodies, gravel particles, which are often ferromagnetic, cause significant streaking artifact on an MRI.23,13 This streaking effect does not occur on plain films, CT, fluoroscopy, or ultrasound.
The use of MRI is limited because of the adequacy of other imaging modalities and the convenience of these modalities relative to MRI. However, MRI should be considered in cases of longstanding wounds or focal infections with unknown etiology in which the presence of a foreign body is being considered.23,24
Ultrasonography
Perhaps the greatest advances in foreign body localization in soft tissue have been as a result of the move toward ubiquitous usage of diagnostic ultrasonography in the emergency department.21,25 Many authors have described bedside ultrasonography, often with the usage of the linear probe and another visualization bladder (like a glove filled with saline or tap water), to be of great benefit in locating and removing soft tissue foreign bodies.26,27,28 Ultrasonography affords the clinician real-time localization and orientation information and can also help in characterizing whether soft tissue edema or abscess is present. Since such findings are critical in both decision-making and in planning the removal of the foreign body, having them available via a convenient, dynamic bedside test is helpful.
Foreign bodies are demonstrated as hyperechoic foci with shadows that depend upon the size and composition of the foreign body. Hyperechoic halos provide evidence of soft tissue inflammation or edema but can also indicate abscess or granulation tissue.25 Because of their higher material densities, metallic or radiopaque foreign bodies often cause hyperechoic comet-tail artifacts.
Ultrasonographically based active guidance of foreign body removal is described by several authors as a technique that reduces procedural time, reduces morbidity, and improves time to detection and procedural outcomes.21,25,12 However, using ultrasonography to detect foreign bodies raises serious issues. Some reports have demonstrated sensitivity rates below 50% for gravel, metal, wood, glass, and plastic with the use of ultrasonography, although more recent reports have improved sensitivities.
The use of ultrasonography in the detection and removal of soft tissue foreign bodies in the emergency department is growing and, as more emergency departments embrace ultrasonography as a technology suited for many purposes, may become as ubiquitous as conventional radiography in the evaluation of soft tissue foreign bodies.
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foreign body removal, foreign body, foreign body wound, soft tissue foreign body, fish hook, nail, impalement, occult trauma, occult foreign body, wound infection, shrapnel, fragment, splinter, staple, needle, bb, projectile, nail gun, bullet, knife removal, radiopaque foreign body, radiolucent foreign body, glass shard, glass shard removal, penetrating trauma, abrasive trauma, foreign body retention, foreign body infection, soft tissue injury, metal shard
Robert Edward Mittendorff II, MD, MBA,
Robert Edward Mittendorff II, MD, MBA is a member of the following medical societies: American Medical Association and Society for Academic Emergency Medicine
Disclosure: Nothing to disclose.
Erik D Schraga, MD, Consulting Staff, Department of Emergency Medicine, Mills-Peninsula Emergency Medical Associates; Consulting Staff, Permanente Medical Group, Kaiser Permanente, Santa Clara Medical Center
Disclosure: Nothing to disclose.
Gil Z Shlamovitz, MD, Assistant Professor of Emergency Medicine, University of Connecticut School of Medicine; Attending Physician, Emergency Department, Windham Community Memorial Hospital, Willimantic, CT; Attending Physician, Emergency Department, Hartford Hospital, Hartford, CT
Gil Z Shlamovitz, MD is a member of the following medical societies: American Academy of Emergency Medicine and American College of Emergency Physicians
Disclosure: Nothing to disclose.
Mary L Windle, PharmD, Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy, Pharmacy Editor, eMedicine
Disclosure: Pfizer Inc Stock Investment from broker recommendation; Avanir Pharma Stock Investment from broker recommendation
Rick Kulkarni, MD, Medical Director, Assistant Professor of Surgery, Section of Emergency Medicine, Yale-New Haven Hospital
Rick Kulkarni, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Emergency Medicine, American College of Emergency Physicians, American Medical Association, American Medical Informatics Association, Phi Beta Kappa, and Society for Academic Emergency Medicine
Disclosure: WebMD Salary Employment
The authors would like to thank the residents and attendings of the Stanford-Kaiser Emergency Medicine residency program for their anecdotal evidence on the techniques described and for specific case materials.
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