JAPANESE JOURNAL OF ORAL & MAXILLOFACIAL SURGERY

Vol. 55 No. 1       2009

ISSN: 0021-5163      UBIC: 151-J

ABSTRACT

A 56-year-old woman presented with a mass in the lower lip, which she had first noticed several months previously. Because the lesion gradually enlarged and was accompanied by tenderness, she visited her family dentist and was referred to our hospital. An elastic, hard mass in the lower lip, approximately 10 mm in diameter, was identified. Magnetic resonance imaging revealed a lesion with high signal intensity and a central region of low signal intensity on T2-weighted imaging. The mass lesion was surgically resected for a clinical diagnosis of benign tumor. The resected lesion was pale yellow. Histopathologically, actinomycotic colonies were identified. The diagnosis was actinomycosis. Key words: actinomycosis, minor salivary glands, lip.

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