Collision tumor: pigmented Bowen's disease and seborrheic keratosis

Fernandes, Karen de Almeida Pinto; Martinez, Diana Carolina Salamanca; Nobre, Aretha Brito; Campos-do-Carmo, Gabriella

doi:10.1590/abd1806-4841.20187117

Cited by 3 publications

(1 citation statement)

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“…Clinical differential diagnoses are (pigmented) basal cell carcinoma, pigmented Bowen’s disease, (verrucous) melanoma, extramammary Paget’s disease, common warts, acanthosis nigricans, and SK-like lesions localized to tattoo 12– 14 . Although most SKs have a maximum diameter of less than 4 cm, sometimes giant lesions develop that raise some possible differential diagnoses, including Buschke–Löwenstein tumors 3 .…”

Section: Differential Diagnosesmentioning

confidence: 99%

Recent advances in managing and understanding seborrheic keratosis

Wollina

2019

F1000Res

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Seborrheic keratosis (SK) is a common benign epidermal tumor with predominance in adult patients. Whereas common SKs are more frequent in Caucasians, dermatosis papulosa nigra is more prevalent in patients with a Fitzpatrick skin type of at least 3. There seems to be a link between extrinsic skin aging and the occurrence of SK. Mutations of fibroblast growth factor receptor 3 and other signaling molecules are a frequent finding in SK lesions. However, this does not translate into any malignant potential. Viral infections are particularly common in genital lesions, although their pathogenetic relevance for SK is questionable. Different histologic and clinical subtypes have been identified. The great variability of SKs raises some difficulties in diagnosis. Dermoscopy is the preferred non-invasive diagnostic method, in particular to differentiate pigmented SKs from other pigment tumors, including cutaneous melanoma. Eruptive SKs can be a paraneoplastic condition known as the Leser–Trélat sign. New targeted cancer treatments can cause a pseudo-Leser–Trélat sign. The treatment in practice is mainly minor surgery, including cryosurgery, shave excisions, and laser-assisted removal. The medical approaches have only limited effects. Recently, two formulations for topical therapy have been evaluated: a product with 40% hydrogen peroxide (HP40) and an aqueous nitric–zinc complex. Based on clinical trials, HP40 seems to be a promising alternative to surgery, in particular for facial lesions.

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Section: Differential Diagnosesmentioning

confidence: 99%