SUMMARY
ABSTRACTA 51 years old patient (MCG) attends to the family doctor's office for a routine check-up. An electrocardiogram is indicated and is transferred to an Internal Medicine Center at "Elena Fernandez de Castro" University Outpatient Clinic, Los Palacios municipality. The patient was diagnosed for first time with situs inversus totalis. To diagnose this entity clinical methods and imaging studies were used. Situs inversus goes unnoticed in the majority of the cases. The diagnosis is incidentally carried out during the transoperative period or as imaging findings, that is why, it is necessary to write an adequate clinical history with a detailed physical examination when suspecting, corroborating it later by means of imaging procedures (thoracic x-ray, ultrasound and computerized axial tomography), making the patient knows the disorder as well as informing it to the health personnel that assist the patient.Key words: Situs inversus, CONGENITAL ABNORMALITIES, DIAGNOSIS.