Squamous cell carcinoma arising in sacrococcygeal teratoma in an adult: A case report

Sacrococcygeal teratomas (SCT) with malignant transformation to squamous cell carcinoma are extremely rare, with only few cases reported in the literature. Herein, we report on a case of a primary sacrococcygeal mature cystic teratoma with malignant transformation into a squamous cell carcinoma. A 53-year-old woman presented with dysuria and lower abdominal pain caused by a huge SCT. Computed tomography (CT), magnetic resonance imaging, and positron emission tomography/CT findings were suggestive of SCT with malignant transformation. The treatment involved robotic-assisted laparoscopic abdominoperineal resection and bilateral lymph node dissection. Histopathology revealed squamous cell carcinoma within the teratoma. Postoperatively, the patient underwent six cycles of paclitaxel-carboplatin chemotherapy and showed no signs of recurrence during the 1-year follow-up.