A resected case of mucoepidermoid carcinoma of the thymus which presented with a low SUVmax on FDG-PET

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  • FDG-PETにおいて軽度の集積率増加を示した胸腺原発Mucoepidermoid carcinomaの一切除例

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Abstract

We report a rare case of mucoepidermoid carcinoma of the thymus which mimicked a benign tumor on preoperative imaging diagnosis, including an FDG-PET study. A 60-year-old female was pointed out as showing an abnormal chest shadow on screening chest radiograph. Further examinations, such as chest CT, chest MRI, and FDG-PET, suggested that she had a stage I thymoma (Masaoka staging system). She was admitted to our hospital, and underwent surgical resection. The postoperative pathological diagnosis revealed that the tumor was a thymic mucoepidermoid carcinoma, of which the clinicopathological features were those of a low-grade histology and low-stage (Stage I) disease. We suggest that the low-grade histology of this case led to a low SUVmax on FDG-PET, whereas previous reports noted that thymic mucoepidermoid carcinoma showed a high SUVmax. As the prognosis of thymic mucoepidermoid carcinoma is said to depend on its histological grade and clinical stage, she has a good prognosis, and showed no signs of recurrence as of 30 months after the initial treatment.

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