Situs inversus totalis is a rare congenital anomaly characterized by a mirror-image arrangement of the thoracic and abdominal organs, with an estimated prevalence of approximately 1 in 10,000 live births [1]. It results from an early embryologic defect in laterality determination, particularly involving visceral rotation and positioning mechanisms [2].

In most cases, situs inversus totalis remains asymptomatic and is incidentally discovered during imaging studies performed for unrelated indications. However, its presence may represent a significant diagnostic challenge in emergency settings because of the discrepancy between the actual anatomical location of the organs and the usual clinical presentation.

Left-sided acute appendicitis in this context is an uncommon but well-documented entity [3]. It may lead to diagnostic delay, particularly in patients presenting with left iliac fossa pain, initially suggesting more common conditions such as sigmoid diverticulitis, colitis, or gynecological disorders. Several studies have shown that this atypical presentation is associated with delayed diagnosis, potentially increasing the risk of complications, especially appendiceal perforation [4].

In our case, the clinical presentation was relatively nonspecific and without signs of severity, highlighting the importance of maintaining a broad differential diagnosis in patients presenting with atypical abdominal pain. The absence of obvious clinical signs and the unusual location of pain strongly support the early use of imaging.

Abdominal computed tomography is currently considered the imaging modality of choice in this setting. It not only confirms the diagnosis of acute appendicitis by demonstrating an enlarged appendix with periappendiceal fat stranding, but also identifies the laterality anomaly, which is a key element in establishing the diagnosis [5]. Furthermore, CT allows exclusion of the main differential diagnoses, particularly left-sided colonic pathologies.

From a therapeutic perspective, management does not fundamentally differ from that of conventional appendicitis. Nevertheless, preoperative recognition of situs inversus totalis is essential for adapting the surgical approach, especially during laparoscopy, where the reversed anatomical orientation may require modification of operative maneuvers.

In addition, it should be emphasized that situs inversus totalis may be associated with other congenital anomalies, particularly cardiovascular abnormalities, thereby warranting further evaluation, especially when incidentally discovered.

Finally, our case highlights the importance of considering “mirror-image” abdominal pathology in the presence of atypical symptoms. Early imaging plays a crucial role in reducing diagnostic errors, avoiding delays in management, and improving patient outcomes.