Reticulohistiocytoma is a rare non-Langerhans-cell histiocytosis. On exposed skin areas it is a cosmetic problem and can cause mechanical irritation due to its prominent nature. We successfully treated a histologically confirmed reticulohistiocytoma on the back of a 60 year old woman with a pulsed dye-laser (wavelength 585 nm, pulse 0.45 msec). The lesion regressed significantly after the first treatment (spot size: 7 mm, fluence 7.8 J/cm(2)). After another laser treatment, the lesion completely disappeared. At 28 month follow-up, no recurrence was seen. Permanent side effects were not observed. In our case report the use of the pumped pulsed dye-laser has proven to be an elegant and low risk treatment option for reticulohistiocytoma. The mechanism of action remains unknown.
As skin resurfacing has become more common, the number of patients developing post-treatment hypopigmentation has increased. No effective treatment for this complication has been developed. Some hypopigmented disorders, including vitiligo, have been treated with the excimer laser. We used the XeCl excimer laser to successfully treat a 78-year-old woman with perioral leukoderma following CO(2) laser skin resurfacing. The repigmentation was stable for at least 16 months. Larger prospective studies of this new therapeutic intervention are recommended to evaluate its efficacy and long-term stability.
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