Subcapsular Hepatic Hematoma Post‑ERCP: Case Report and Review of the Literature
Executive Summary
Subcapsular hepatic hematoma (SHH) is a rare but potentially life-threatening complication of Endoscopic Retrograde Cholangiopancreatography (ERCP). While the most common complications of ERCP include pancreatitis, cholangitis, and duodenal perforation, SHH represents a significant diagnostic challenge due to its rarity and variable clinical presentation. Based on a review of 29 documented cases, the mortality rate is approximately 4%.
The primary mechanisms for SHH involve accidental vessel laceration by guidewires or traction-induced damage by extraction balloons. Diagnosis is typically confirmed via Computed Tomography (CT) following symptoms of abdominal pain or acute anemia. Management is dictated by hemodynamic stability; a conservative approach is the standard of care for stable patients, with interventional radiology or surgery reserved for cases of clinical deterioration or hematoma rupture.
Analysis of the Clinical Case
The briefing is centered on a case involving a 75-year-old male admitted with acute pancreatitis and choledocholithiasis.
Patient Profile and Procedure
Medical History: Past myocardial infarction, angioplasty, stents, and a pacemaker implant. The patient was on daily low-dose aspirin, which was discontinued three days prior to the procedure.
Initial Findings: Admission blood tests showed elevated amylase (1661 U/L), AST (166 U/L), and ALT (106 U/L).
The Procedure: ERCP involved cannulation with a 0.35-inch hydrophilic guidewire, sphincterotomy, and the use of a Fogarty balloon to extract stones from a dilated common bile duct.
Post-Procedural Complication
Two days post-procedure, the patient developed acute severe anemia (Hemoglobin dropped to 8.3 g/dL) and passed dark, semifluid feces. Notably, the patient did not report the typical abdominal pain associated with this complication.
Diagnostic Confirmation
A repeat abdominal CT scan revealed a large (12 × 8 cm) subcapsular and intraparenchymal hematoma in the right liver segments (VI, VII, and VIII). Pneumobilia was also noted in the left lobe. Contrast-enhanced ultrasound later documented the stability of the hematoma.
Etiology and Pathophysiological Mechanisms
The literature suggests two primary hypotheses regarding how ERCP maneuvers lead to hepatic hematoma:
Predisposing Factors
While not definitively proven in existing studies, evidence suggests that anatomical anomalies of the biliary tree may increase the risk of this complication. In the reported case, the patient possessed a biliary trifurcation, which may have made the operative maneuvers more hazardous.
Clinical Presentation and Diagnosis
The clinical onset of SHH varies significantly, ranging from two hours to 15 days post-ERCP.
Symptomatology:
Abdominal Pain: Reported by 89.6% of patients, typically in the right upper quadrant.
Right Shoulder Pain: A frequent referred pain symptom.
Acute Anemia: Occurs in 24.1% of cases.
Fever: Occurs in 20.6% of cases, raising the risk of an infected hematoma.
Diagnostic Tools: CT scans are the gold standard for identifying the size and location of the hematoma and detecting active bleeding or intra-hematoma air. Ultrasound with contrast (e.g., SonoVue™) is useful for monitoring hematoma stability.
Management and Treatment Strategies
Treatment must be personalized based on the patient's hemodynamic status and the progression of the hematoma.
Conservative Management (41.3% of cases)
This is the preferred approach for hemodynamically stable patients. It involves:
Close monitoring of hemoglobin levels.
Analgesia.
Broad-spectrum prophylactic antibiotics (to prevent infection of the hematoma, as ERCP is not a sterile technique).
Interventional and Surgical Options
When clinical deterioration occurs, more aggressive measures are required:
Percutaneous Drainage (27.6%): Conducted under CT or ultrasonic guidance.
Selective Embolization (20.7%): Superselective embolization of the involved vessels.
Surgery: Includes drainage of the hematoma and direct hemostasis. This is indicated in cases of hemodynamic shock or high risk of rupture.
Key Findings from Literature Review
A synthesis of 29 documented cases highlights the following trends:
Demographics: Patients range from age 15 to 98.
Guidewire Usage: In nearly all documented cases where the data was available, a guidewire was utilized during the procedure.
Outcomes: Most cases result in successful recovery through conservative or minimally invasive means, though surgical intervention was required in several instances (e.g., Cases 21, 26, 27, 28, and 29).
Expert Conclusions and Key Messages
Differential Diagnosis: In any patient showing a marked drop in hemoglobin levels or reporting right-sided abdominal/shoulder pain after ERCP, subcapsular hepatic hematoma must be considered.
Conservative First: Hemodynamic stability is the primary determinant for treatment; a conservative approach should be exhausted before moving to invasive procedures.
Awareness of Anomalies: Physicians should exercise heightened caution during operative maneuvers in patients with known biliary tree anomalies, such as trifurcations.
Underdiagnosis: The incidence of SHH is likely higher than reported, as asymptomatic patients may go undiagnosed.
