RESUMEN
Background: Postoperative pyoderma gangrenosum (PPG) is a rare inflammatory skin disease of unknown etiology characterized by blistering and ulcerative lesions in postoperative wounds. Untreated pyoderma gangrenosum (PG) is potentially life-threatening; therefore, immediate and appropriate treatment is essential. Although PPG and surgical site infection (SSI) present similar clinical findings, they should be differentiated because of their conflicting treatment modalities. Case presentation: An 82-year-old man with comorbidities of pulmonary tuberculosis, chronic obstructive pulmonary disease, and diabetes underwent laparoscopic gastrectomy for gastric cancer. On postoperative day 6, fever exceeding 39°C, port wound redness, and pain was observed. Laboratory tests revealed severe inflammatory reactions: white blood cell, 42,800/µL and C-reactive protein, 30.2 mg/mL. The patient was diagnosed with SSI and treatment with antibiotics and drainage was started; however, his general and wound conditions also worsened. Therefore, he was diagnosed with PG because painful skin findings were exacerbated by external stimuli and no significant bacteria were detected in the culture test. Treatment with oral prednisolone was started, which significantly improved his skin and inflammatory conditions. Conclusion: We managed a rare case of PPG that occurred in a port wound after laparoscopic gastrectomy. If atypical clinical findings of postoperative SSI are observed, general surgeons should recognize and consider PPG as a differential diagnosis.