Photodynamic diagnosis-guided treatment of Erythroplasia of Queyrat with ALA-PDT: A case report

Queyrat erythroplasia (EQ) is a rare form of squamous cell carcinoma (SCC) in situ, commonly found on the glans, penis, and coronary sulcus, and clinically presenting as one or more well-marginated erythematous velvety plaques. EQ can transform into invasive SCC and requires early diagnosis and treatment. Photodynamic diagnosis (PDD) is a fluorescence imaging technique that can be used for a wide range of non-pigmented skin tumours, helping us to diagnose skin tumours and monitor efficacy. Here, we report a case of EQ successfully treated with 5-aminolevulinic acid photodynamic therapy (ALA-PDT) assisted by PDD technology, suggesting that PDD technology has a role in the treatment and diagnosis of patients with EQ.