Overview
Clear cell acanthoma (CCA) is a benign epidermal tumor characterized by acanthotic epidermis with clear cells and a distinctive collarette scale 1. It can present in various atypical forms, including cystic, polypous structures, and multiple lesions 25.Diagnosis
Dermoscopic Features: Squamous surface with a translucent collarette, dilated capillary loops oriented perpendicularly to the skin surface, resembling psoriasis-like patterns 1.
Histological Criteria: Acanthotic epidermis with clear cells, often showing a collarette of parakeratotic scale 24.
Melanocyte Presence: Melanocytes are consistently present but with variable density 4.Management
Surgical Excision: Primary treatment for definitive diagnosis and management of solitary lesions 3.
Cryotherapy: Effective for multiple or persistent lesions, particularly useful in cases with associated conditions like dry skin and varicose veins 3.
Monitoring: For asymptomatic cases, regular monitoring may be sufficient if lesions are solitary and stable 3.Special Populations
Comorbidities: Presence of conditions like dry skin and varicose veins may correlate with multiple CCA lesions 3.
Treatment Considerations: Cryotherapy may be particularly beneficial in elderly patients with multiple lesions 3.Key Recommendations
Utilize dermoscopic findings, particularly psoriasis-like vascular patterns, as supportive evidence for diagnosing CCA (Evidence: Moderate 1).
Consider cryotherapy as a viable treatment option for multiple or persistent CCA lesions, especially in patients with associated comorbidities (Evidence: Weak 3).
Exclude surgical excision for definitive diagnosis and management of solitary CCA lesions (Evidence: Expert opinion 3).References
1 Bugatti L, Filosa G, Broganelli P, Tomasini C. Psoriasis-like dermoscopic pattern of clear cell acanthoma. Journal of the European Academy of Dermatology and Venereology : JEADV 2003. link
2 Hamaguchi T, Penneys N. Cystic clear cell acanthoma. Journal of cutaneous pathology 1995. link
3 Betti R, Bruscagin C, Inselvini E, Palvarini M, Crosti C. Successful cryotherapic treatment and overview of multiple clear cell acanthomas. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] 1995. link
4 Fanti PA, Passarini B, Varotti C. Melanocytes in clear cell acanthoma. The American Journal of dermatopathology 1990. link
5 Petzelbauer P, Konrad K. Polypous clear cell acanthoma. The American Journal of dermatopathology 1990. link