Appendicitis Signs – Clinical Diagnosis Guide
Appendicitis signs are clinical examination findings that indicate inflammation of the appendix. They help physicians quickly identify and diagnose appendicitis.
Things worth knowing about "Appendicitis Signs"
Appendicitis signs are clinical examination findings that indicate inflammation of the appendix. They help physicians quickly identify and diagnose appendicitis.
What Are Appendicitis Signs?
Appendicitis signs are specific physical examination findings used in the clinical diagnosis of appendicitis (inflammation of the vermiform appendix). They arise from irritation of the peritoneum (the lining of the abdominal cavity) near the inflamed appendix, and they help the examining physician confirm or rule out a suspected diagnosis of appendicitis.
Key Appendicitis Signs
McBurney Sign
The McBurney sign is one of the most well-known appendicitis signs. It describes tenderness at the McBurney point, located in the right lower abdomen – at approximately one-third of the distance from the right anterior superior iliac spine to the navel. Significant pain at this point is a strong indicator of appendix inflammation.
Lanz Sign
The Lanz sign refers to tenderness at the Lanz point, located at the junction of the right and middle thirds of the line connecting both anterior superior iliac spines. It is another useful indicator of appendicitis.
Blumberg Sign (Rebound Tenderness)
The Blumberg sign describes rebound tenderness: when the physician presses on the left lower abdomen and then suddenly releases the pressure, a sharp pain is felt in the right lower abdomen. This sign indicates peritoneal irritation and is considered an important warning signal for appendicitis.
Rovsing Sign
The Rovsing sign is elicited by applying pressure in the left lower abdomen and stroking toward the right lower abdomen. If this maneuver causes pain in the right lower abdomen, the sign is considered positive. The mechanism involves retrograde displacement of intestinal gas, which irritates the inflamed appendix.
Psoas Sign
The psoas sign (also called the iliopsoas sign) is positive when extension or elevation of the right leg against resistance causes pain in the right lower abdomen. This occurs because the iliopsoas muscle lies in close proximity to the appendix and becomes irritated by the nearby inflammation.
Obturator Sign
The obturator sign is positive when passive flexion and internal rotation of the right hip joint produces pain in the right lower abdomen. It suggests a pelvic or retrocecal position of the inflamed appendix.
Sitkovskij Sign
The Sitkovskij sign is positive when the patient experiences pain in the right lower abdomen while lying in the left lateral decubitus position. The change in position shifts intestinal contents and increases pressure on the inflamed appendix.
Clinical Significance and Diagnosis
No single appendicitis sign is conclusive on its own. In clinical practice, multiple signs are evaluated together. Standardized scoring systems such as the Alvarado Score or the Pediatric Appendicitis Score (PAS) are commonly used to estimate the probability of appendicitis. These scores combine physical findings with laboratory results (e.g., elevated white blood cell count, elevated CRP) and symptoms (e.g., nausea, fever).
Imaging studies such as ultrasound and computed tomography (CT) are used alongside clinical examination to confirm the diagnosis and rule out complications such as perforation or abscess formation.
When to Seek Immediate Medical Attention
The following symptoms require prompt medical evaluation in an emergency setting:
- Severe, persistent pain in the right lower abdomen
- Pain that worsens with movement or physical shock
- Fever combined with abdominal pain
- Nausea, vomiting, and loss of appetite
- A rigid, board-like abdomen (sign of peritonitis)
Untreated appendicitis can lead to perforation of the appendix, causing life-threatening inflammation of the peritoneum known as peritonitis.
References
- Schwartz's Principles of Surgery, 11th Edition, McGraw-Hill Education, 2019.
- S2k Clinical Guideline on Appendicitis, German Society for General and Visceral Surgery (DGAV), 2018.
- Petroianu A. - Diagnosis of acute appendicitis. International Journal of Surgery, 2012; 10(3): 115–119. PubMed PMID: 22326553.
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