Necrotizing fasciitis (NF) type I is an acute subcutaneous tissue infection that can promptly disseminate generating crepitus. If not accurately diagnosed and expeditiously treated, it becomes a life-threatening infection. In this report, we present a 65-year-old man who developed a case of NF after a hemiglossectomy resecting a tumor in the dorsal surface of the tongue. A biopsy was performed, and he was pathologically diagnosed with squamous cell carcinoma (T2N1M0). The patient underwent preoperative oral cleaning. Right hemiglossectomy was performed by cervical dissection, pull-through style, with tooth removal on the right mandible and a left anterolateral femoral flap reconstruction. Routine intraoperative lavage was performed with 2000 mL of saline solution. Cefazolin 1gr was administered two times per day postoperatively. Four days after primary surgery, the flap circulation was inadequate; therefore, a computed tomography scan was taken, which indicated gas in the ventral neck area. Tooth extraction was the suspected etiology. Debridement was performed; the abscess was drained and cultured, indicating the presence of Staphylococcus haemolyticus and Escherichia coli. It seems that the abscess was not formed by NF, but rather by leachate reservoir associated with the head and neck tumor. After debridement, re-reconstruction was performed with a deltopectoral flap and pectoralis major myocutaneous flap. When NF is present after a neck dissection, there is a risk of disruption due to the direct invasion and inflammation into the carotid artery. Therefore, it is important to provide adequate oral cleaning care before the surgery and early suspicion of the diagnosis.
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