An unusual green macular lesion of the gingiva: a foreign-body granulomatous reaction

The current clinical case highlights the diagnostic process in characterizing an unusual green macular lesion of the maxillary gingiva. A review of the history revealed that the patient had suffered trauma to the oral tissues during a soccer match 2 years prior. An incisional biopsy was performed and microscopic analysis demonstrated the presence of a granulomatous reaction to a needle-shaped, birefringent foreign material. Comparative analysis of a specimen collected from the soccer field confirmed that the foreign material was artificial grass. Foreign material was also found inside the gingival epithelial cells.