Severe Postoperative Complications Following Bilateral DIEP Flap Breast Reconstruction in a High-Risk Patient: A Case Report

Background/Objectives: Deep inferior epigastric perforator (DIEP) flap reconstruction is considered the gold standard for autologous breast reconstruction due to its favorable aesthetic results and low donor site morbidity. Nevertheless, it remains associated with potentially life-threatening complications such as deep vein thrombosis (DVT) and pulmonary embolism (PE). This report aims to describe a complex clinical case in which severe thromboembolic and ischemic complications occurred despite adherence to standard prophylactic protocols. Methods: We present the case of a 65-year-old female with multiple thromboembolic risk factors—including obesity, a history of heavy smoking, hormone therapy, and prior COVID-19 infection—who underwent immediate bilateral breast reconstruction with DIEP flaps following mastectomy. Results: Within the first 24 h postoperatively, the patient developed a massive pulmonary embolism requiring intensive care management. Despite appropriate anticoagulation and supportive measures, she subsequently experienced full-thickness necrosis of the central portion of the abdominal flap. Thrombophilia screening and diagnostic imaging did not reveal peripheral venous thrombosis, raising the hypothesis of a hypercoagulable state potentially related to prior SARS-CoV-2 infection. Conclusions: This case underscores the importance of individualized risk stratification and suggests that current prophylaxis protocols may be insufficient for patients with overlapping thrombotic risk factors. The findings advocate for further investigation into the long-term vascular effects of COVID-19 and support reconsidering extended or intensified prophylaxis in high-risk populations undergoing complex microsurgical procedures.