Management of Splenic Lesions
The management of splenic lesions depends critically on whether they are traumatic or incidental findings, with hemodynamic status being the primary determinant for traumatic injuries and imaging characteristics guiding the approach to incidental lesions.
Traumatic Splenic Lesions
Initial Assessment and Diagnostic Approach
For trauma patients, CT scan with intravenous contrast is the gold standard in hemodynamically stable or stabilized patients 1. E-FAST (Extended Focused Assessment with Sonography for Trauma) is effective and rapid for detecting free fluid but should not replace CT when the patient is stable 1.
Hemodynamic instability is defined as admission systolic blood pressure <90 mmHg with evidence of vasoconstriction, altered consciousness, or shortness of breath; OR >90 mmHg but requiring bolus infusions/transfusions and/or vasopressors; OR base excess >-5 mmol/L; OR shock index >1; OR transfusion requirement of 4-6 units of packed red blood cells within 24 hours 1.
Treatment Algorithm for Adults
Hemodynamically unstable patients require immediate operative management (OM) 1. This includes patients who are transient responders (initially respond to resuscitation but show ongoing blood loss).
For hemodynamically stable patients, non-operative management (NOM) is the preferred approach 1. However, NOM should only be attempted in centers with:
- Precise diagnostic capabilities
- Intensive care monitoring with serial clinical examination
- Immediate access to interventional radiology and surgery
- Readily available blood products 1
Important caveat: Injury grade on CT scan, extent of free fluid, and presence of pseudoaneurysm (PSA) do not reliably predict NOM failure 1. Clinical judgment and serial monitoring remain paramount.
Pediatric Considerations
In children (<15 years old), NOM is even more successful than in adults, with splenic preservation rates of 95-100% in appropriate centers 1. The Eastern Association for the Surgery of Trauma (EAST) recommends NOM in all hemodynamically stable children regardless of AAST injury grade 1.
The vast majority of pediatric patients do not require angiography/angioembolization (AG/AE) for CT blush or moderate to severe injuries 1. AG/AE may be considered only in hemodynamically stable patients with signs of persistent hemorrhage not amenable to NOM, once extra-splenic bleeding sources are excluded 1.
Follow-Up After Trauma
In the first 24-72 hours: Serial abdominal examinations and hematocrit determination every 6 hours are necessary for low-grade injuries (AAST I-II) 1.
Repeat CT scanning during admission should be considered in:
- Patients with decreasing hematocrit
- AAST grades III-IV injuries
- Subcapsular hematoma
- Underlying splenic pathology or coagulopathy
- Neurologically impaired patients 1
Post-discharge imaging: Routine follow-up CT is not necessary for low-grade injuries (AAST I-II) 1. For moderate and severe injuries, CT follow-up should be considered in patients with underlying splenic pathology, coagulopathy, or neurological impairment 1.
Doppler ultrasound (DUS) and contrast-enhanced ultrasound (CEUS) are reasonable alternatives for follow-up, particularly in children to minimize radiation exposure 1.
Activity Restriction
Activity restriction should be 4-6 weeks for minor injuries and 2-4 months for moderate and severe injuries 1. Complete healing typically occurs by 3 months post-injury 1.
Critical warning: Patients must be counseled not to remain alone or in isolated places for the first weeks after discharge and should be warned about alert symptoms, as delayed rupture carries 5-15% mortality compared to 1% for acute rupture 1.
Post-Splenectomy/Angioembolization Care
All patients who undergo splenectomy or total splenic vascular exclusion must receive immunization against encapsulated bacteria (S. pneumoniae, H. influenzae, N. meningitidis) 1.
Vaccination timing:
- Ideally ≥14 days after splenectomy for optimal antibody response 1
- However, if discharge occurs before 15 days and there is high risk of missing vaccination, vaccinate before discharge 1
Annual influenza vaccination is recommended for all patients over 6 months of age 1.
Antibiotic prophylaxis: Patients should have standby antibiotics for any sudden onset of fever, malaise, or chills, especially when medical review is not readily accessible 1. The risk of overwhelming post-splenectomy infection (OPSI) is 0.5-2% with 30-70% mortality, highest in the first year but elevated for life 1.
Incidental Splenic Lesions
Imaging Workup
For incidental splenic lesions discovered on imaging, the approach is based on number and consistency 2:
Solitary cystic lesions: Consider true cysts, pseudocysts, or parasitic cysts 2.
Multiple cystic lesions: Differential includes infectious lesions (abscess/microabscesses) or lymphangioma 2.
Solitary solid lesions: Hemangioma is most common, but also consider hamartoma, sclerosing angiomatoid nodular transformation, inflammatory pseudotumor, or lymphoma 2.
Multiple solid lesions: Consider sarcoidosis, littoral cell angioma, or lymphoma 2.
CT and MRI are the diagnostic tools of choice 3. MRI can aid in lesion characterization when CT findings are equivocal 3.
When to Biopsy
Most splenic lesions are benign and can be correctly identified based on imaging characteristics alone 3. Invasive evaluation is only necessary for lesions with uncertain or potentially malignant etiology 3.
When biopsy is indicated, image-guided biopsy should be preferred over splenectomy 4. Modern data show that CT- and US-guided splenic procedures are safer than previously assumed 4.
Pediatric Primary Splenic Lesions
In children, vascular malformations, splenic cysts, and littoral cell angiomas are the most common primary lesions 5. Partial splenectomy is safe and effective as a spleen-preserving approach 5. Transumbilical single-port laparoscopic partial splenectomy offers superior cosmetic results and is particularly suitable for pediatric patients 5.
Thromboprophylaxis Considerations
Mechanical prophylaxis is safe and should be considered in all trauma patients without absolute contraindication 1.
Splenic trauma without ongoing bleeding is not an absolute contraindication to LMWH-based prophylactic anticoagulation 1. LMWH prophylaxis should be started as soon as possible and may be safe in selected patients with blunt splenic injury undergoing NOM 1.