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  • Title: Luna stain: a simple and cost-effective diagnostic tool helps in detecting eosinophilic granules deposition of flame figures and aids in diagnosing eosinophilic cellulitis "Wells Syndrome".
    Author: Mejbel HA, Preiszner J, Shurbaji MS, Leicht SS, Youngberg GA.
    Journal: J Histotechnol; 2020 Dec; 43(4):196-199. PubMed ID: 33245262.
    Abstract:
    We report a rare case of Wells syndrome in which a 61-year-old Caucasian male presented with three distinct skin lesions including a cutaneous bulla, an erythematous plaque, and a linear streak located on the patient's left anterior thigh, left dorsal wrist, and left anterior forearm, respectively. Histologic examination revealed diffuse and interstitial eosinophilic infiltrate admixed with lymphocytes and macrophages that predominantly involve the dermis. Nodular aggregates of eosinophils surrounding dermal collagen fibers suggestive of 'flame figures' were identified. Luna histochemical stain was used and highlighted the deposition of eosinophilic granules over the collagen bundles confirming the presence of flame figures. Laboratory workup revealed peripheral eosinophilia, but a comprehensive clinical evaluation failed to reveal a systemic disease and ultimately the diagnosis of eosinophilic cellulitis 'Wells Syndrome' was rendered. After a short course of immunosuppressive therapy, the patient experienced a complete resolution of the skin lesions on his last follow-up visit several weeks from the initial diagnosis. This case highlights the various clinical forms that Wells syndrome may present with and may serve as a good example for the use of Luna stain as a simple and cost-effective diagnostic tool that can help to arrive at the accurate diagnosis and inform therapy.
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