チタンが検出された口腔粘膜色素斑

・口蓋に生じた異物沈着による色素斑を経験した．

・X線微量点分析では，主としてチタンが検出された．

（「症例のポイント」より）

　

Oral pigmented lesion caused by the deposition of titanium

　

Urano, Shoko1）Kimu, Taishi2）Ohta, Isao3） 1）Department of Dermatology, Enshu General Hospital 2）Department of Plastic Surgery, Enshu General Hospital 3）Preeminent Medical Photonics Education and Research Center, Hamamatsu University School of Medicine

　

A 61-year-old female was pointed out an asymptomatic pigmented lesion by a dentist. After 4 days, she visited our hospital for the evaluation of the lesion. Physical examination revealed a 3×2 mm blue-grey macule on the palate. With the main differential diagnosis of malignant melanoma, the lesion was completely excised. Histological examination showed numerous granular and irregular dark brown deposits being distributed among collagen fibers, which extends through the entire dermis to subcutaneous fat. An X-ray microanalysis revealed that the depositions consisted mainly of titanium.