What could cause left upper quadrant (LUQ) pain when the right lower quadrant (RLQ) is palpated?

Rovsing's Sign: Left Upper Quadrant Pain When Palpating the Right Lower Quadrant

The clinical finding you're describing is most likely Rovsing's sign, which is a classic indicator of acute appendicitis, though the sign typically refers to RLQ pain when palpating the LLQ (not LUQ). If you're truly observing LUQ pain with RLQ palpation, this is highly atypical and should raise concern for either an unusual anatomical variant (such as intestinal malrotation with malpositioned appendix) or referred pain from peritoneal irritation 1, 2, 3.

Understanding the Clinical Presentation

Classic Rovsing's Sign

• Standard presentation: Pain in the RLQ when palpating the left lower quadrant (LLQ)
• Mechanism: Suggests peritoneal irritation from appendicitis, as pressure on the left colon displaces gas toward the inflamed appendix in the RLQ
• Significance: Increases likelihood of acute appendicitis when present

Atypical LUQ Pain with RLQ Palpation

If you're genuinely eliciting LUQ pain (not RLQ pain) when palpating the RLQ, consider:

1. Intestinal Malrotation with Malpositioned Appendix

• The appendix may be located in an abnormal position (including left-sided or high-riding)
• Acute appendicitis can present with LUQ pain in patients with congenital intestinal malrotation 2, 3
• This is rare but well-documented in case reports
• CT imaging is essential to identify anatomical variants and confirm diagnosis 2, 3

2. Diffuse Peritonitis

• Advanced appendicitis with perforation can cause diffuse peritoneal irritation
• Pain may be referred to distant quadrants including the LUQ
• Look for signs of systemic toxicity, fever, and diffuse tenderness

3. Mislocalization or Referred Pain

• Patients may have difficulty precisely localizing visceral pain
• Verify the exact location of tenderness with careful repeat examination

Diagnostic Approach

Immediate Steps:

1. Clarify the examination finding: Confirm whether pain is truly in the LUQ or if this is RLQ pain (classic Rovsing's sign)
2. Assess for appendicitis: Fever, leukocytosis, anorexia, migration of periumbilical pain to RLQ 1
3. Look for anatomical clues: Dextrocardia on exam, previous imaging showing malrotation

Imaging Strategy:

• CT abdomen and pelvis with IV contrast is the definitive study 1, 4
• Sensitivity 95% and specificity 94% for appendicitis 1
• Will immediately identify intestinal malrotation and malpositioned appendix 2, 3
• Provides comprehensive evaluation of all abdominal quadrants for alternative diagnoses 1, 4

Key Differential Diagnoses

If truly LUQ pain:

• Intestinal malrotation with left-sided or high appendicitis 2, 3
• Splenic pathology (infarct, abscess, rupture)
• Gastric pathology (perforation, gastritis)
• Pancreatic tail pathology
• Left renal pathology
• Splenic flexure colitis

If actually RLQ pain (classic Rovsing's):

• Acute appendicitis (most likely) 1
• Right colonic diverticulitis (8% of RLQ pain) 1
• Infectious enterocolitis
• Ureteral stone
• Bowel obstruction (3% of RLQ pain) 1

Critical Pitfalls to Avoid

1. Don't dismiss atypical presentations: Appendicitis with intestinal malrotation can present with LUQ pain and be easily missed 2, 3
2. Don't rely solely on clinical scoring systems: Alvarado scores have limited accuracy and should not replace imaging when clinical suspicion persists 1
3. Don't delay CT imaging: Even with atypical presentations, CT provides rapid diagnosis without increasing perforation rates 1
4. Serial examinations are valuable: If initial imaging is negative but peritoneal signs persist, maintain high suspicion and consider repeat imaging or surgical consultation 5

Management Algorithm

High suspicion for appendicitis (fever, leukocytosis, peritoneal signs):

• Obtain CT abdomen/pelvis with IV contrast immediately 1
• Surgical consultation if CT confirms appendicitis or shows malrotation
• Proceed to surgery even if anatomy is atypical 2, 3

Uncertain diagnosis with persistent focal tenderness:

• CT abdomen/pelvis with IV contrast to evaluate all quadrants 4
• Serial abdominal examinations every 4-6 hours
• Surgical consultation if exam worsens or remains unchanged 5

The bottom line: True LUQ pain with RLQ palpation is not a recognized classic sign and warrants immediate CT imaging to identify anatomical variants or alternative pathology that requires urgent intervention 4, 2, 3.