Successful Use of Grenz Rays for Disseminated Superficial Actinic Porokeratosis: Report of 8 Cases

Background: Disseminated superficial actinic porokeratosis (DSAP) is a rare keratinization disorder with potential malignant transformation, for which present treatment strategies show limited success. Aim: To evaluate the response of DSAP lesions to grenz ray radiotherapy (RTx). Methods: Data of patients treated with RTx at University Hospital Zurich, Switzerland, between 2004 and 2015, were reviewed. Patients with DSAP, who received at least 1 RTx treatment session and who had been followed up for at least 4 weeks were included in the further data analysis. Results: The study cohort consisted of 8 patients with a median age of 73 years (range 54-84). All were treated with grenz rays for DSAP. Most (7/8) patients showed complete clinical clearing of the lesions. All patients experienced temporary side effects of RTx, which resolved within 4 weeks after the last irradiation. Conclusion: We suggest radiotherapy with grenz rays as a treatment option for DSAP.
Dermatology

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