Undifferentiated pleomorphic sarcoma (UPS) in the mandible region is a rare malignant neoplasm. We encountered the case of a patient who had been diagnosed with deep benign fibrous histiocytoma (DBFH) prior to surgery, but the final biopsy revealed the presence of tumor tissues in the resected margin, which indicated a UPS. Therefore, radiotherapy was conducted post-operatively, but the tumor recurred approximately 3 years later and a second surgery was performed. The difference between the initial and final diagnoses was considered to be due to the characteristics of the tumor, as it involved both benign and malignant components. DBFH and UPS can occur in young women. DBFH can transform to a malignancy and UPS may also appear as a benign tumor during early biopsy. Hence, attention should be paid to diagnosis and treatment methods, and ongoing close observation is required.

The purpose of this paper is to suggest a more methodical and efficient means to make Korean high school students understand the usages of two French past tenses, viz passé composé and imparfait. The paper shows that these two tenses are distributed in a complementary way on textual level, and that two conceptual devices developed by Weinrich, foreground and middle ground, can be useful for the teachers' teaching skills. The paper also discusses the anaphoricity, redefined and remodulated by Berthonneau and Kleiber on the semantico-pragmatic basis, for a new means of teaching French past tenses.