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Non-Hodgkin's lymphoma (NHL) is a lymphoproliferative malignancy that can involve both lymph node and lymphoid organs as well as extranodal organs and tissues. The aim of presenting this case of NHL is to highlight the suspicion of its occurrence in the region of unhealed extraction sockets and the significance of its awareness. NHL can be presented in various forms; therefore, a thorough knowledge regarding this malignancy is essential for arriving at the earliest possible diagnosis and therapy for the patient.

The term “synovial sarcoma (SS)” is a histological error, a misnomer as it neither arises from nor differentiates toward synovium. Head and neck region is the most commonly affected region after extremities, representing 5% of all cases. This case report focuses to discuss a case of a SS that was diagnosed after an inadvertent root canal therapy. A 46-year-old male came to the outpatient department with a chief complaint of pain and swelling in his upper right back tooth region since 15 days. An ulceroproliferative mass of was observed protruding from the gingivobuccal sulcus from 11 to 15 tooth region obliterating the vestibule.

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