Introduction. Internal hernias represent the protrusion of intestinal loops through congenital or acquired openings into the mesentery or peritoneum. One such hernia is the paraduodenal hernia, which is the most common type of internal hernia (53%). Due to the variable and non-specific clinical presentation, the preoperative diagnosis of these hernias is difficult. Despite the available studies, they generally present with intestinal occlusion, making their diagnosis during laparoscopy or laparotomy. Preoperative abdominal computed tomography facilitates diagnosis and timely surgical intervention [3]. Case presentation. This paper presents the case of a 19-year-old male patient with left paraduodenal hernia. He came to the emergency room with severe abdominal pain. Diagnosis was established by computed tomography and a converted surgical procedure was successfully performed. Discussion: Acute intestinal obstruction caused by a left paraduodenal hernia is a rare cause of intestinal obstruction. Conclusion. The patient underwent an exploratory laparotomy and it was found that the herniated intestine was viable, for which it was decided to reduce it and close the defect, obtaining good clinical results in the patient.