In a large number of cases, post-traumatic diaphragmatic hernias (PTDH) are a consequence of occult diaphragmatic injuries associated with penetrating abdominal trauma. We present a case of a 26-year-old male patient who, 2 months prior to the current admission, sustained a non-penetrating stab wound to the left anterior chest below the nipple. Upon presentation the patient complained of epigastric pain radiated to the left shoulder, and nausea and vomiting. The chest X-ray, and abdominal and thoracic CT scan were inconclusive. The patient was sutured and discharged. The laparoscopic approach was selected as a diagnostic and minimally invasive therapeutic method. The suspected diagnosis of PTDH was confirmed. The herniated organs (transverse colon, small bowel loops, and greater omentum) were reduced, and the diaphragmatic defect was sutured by placing 3 non-resorbable 2.0 knots. The suture was reinforced with a composite mesh affixed with resorbable clips. Postoperative period was uneventful, and the patient was discharged 4 days later.