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A 40-year-old woman had a 13-year history of right maxillary sinusitis. Her medical history was clinically significant for idiopathic, self-resolved chest pain and cesarean section. She described a history of extraction of an endodontically treated maxillary right first molar. She had been informed she likely had a remnant of the extracted tooth and possibly gutta-percha in her sinus, as suggested at the time by sinus opacification reportedly observed by radiographic imaging. Over time, she was treated with multiple courses of antibiotics, which provided only temporary relief of her sinusitis symptoms; she experienced recurrences of her symptoms shortly after completing each course.