The article reports a clinical case of a 39-year-old male patient who was admitted in the emergency room in shock. The clinical exams and additional tests identified a right massive hemothorax, without apparent etiological factors. He was submitted to an emergency right thoracotomy. A bulky varicose formation in the diaphragmatic surface, with evident laceration and haemorrhage was identified. The article describes this case due to its rarity. The varicose formation was simply ligated and the evolution, as well as the outcome of this clinical case was uneventful.