Cornoid Lamellation Associated With Lichen Sclerosus To the Editor: Although cornoid lamellation is the histological feature that characterizes porokeratosis, it is not limited to porokeratosis and may be encountered in a wide range of other inflammatory and neoplastic skin diseases.1 A cornoid lamella reflects disordered progression of epidermal cells to cornification and should be regarded as one of the “minor tissue reactions” in a variety of other inflammatory skin disorders.2 Cornoid lamellation has recently been revisited to define the large clinicopathological spectrum of porokeratosis and to establish nonporokeratotic conditions in which cornoid lamellas can appear.3 We report for the first time cornoid lamella in association with lichen sclerosus (LS), which seems to reflect an incidental finding, and has to be recognized and differentiated from porokeratosis. A 51-year-old man presented to the Dermatology clinics with asymptomatic, large lichenified plaques developing within an erythematous surface affecting his upper arm and shoulder (Figs. 1A, B). The lesions initially appeared as small pink plaques, which then enlarged and evolved with whitish scaling, which did not respond to antifungals. A biopsy taken from the upper arm showed extensive eosinophilic homogenization of the papillary and superficial reticular dermis, immediately beneath the epidermis and focal vacuolization of the dermal–epidermal junction, with scant superficial perivascular lymphocytic infiltrate (Fig. 2A). The epidermis was slightly atrophic, and no necrotic keratinocytes were observed. Marginated on the sides of the atrophic epidermis, we could focally note vertical columns of parakeratosis overlying areas of epidermis with loss of the granular layer and dyskeratotic cells (Figs. 2B–D).

The authors declare no conflicts of interest.

FIGURE 1. Clinical features of extragenital LS. Coalescing erythematous macules with ivory white surface and well-defined borders (A). Higher magnification of the lesion shows ivory white surface of the lesions, slightly scaly (B).

Cornoid lamella, characterized by a tilted vertical column of parakeratosis overlying an area of hypogranulosis with dyskeratotic cells, can be subtle and easily overlooked clinically and can histologically hinder the diagnosis. Cornoid lamellation is a constant histological marker of porokeratosis. Different subtypes of porokeratosis are well characterized based on the number, size, and distribution of the annular lesions or papules and the prominence and distribution of the cornoid lamellas.3 However, it is also accepted in the literature that cornoid lamellation is not pathognomonic of porokeratosis and can also be found in a variety of inflammatory or neoplastic conditions,1 in which it represents a distinctive histologic reaction pattern that reflects disordered progression of epidermal cells to cornification. Inflammatory disorders including psoriasis, lichen planus–like keratosis, Wong type-dermatomyositis, keratosis lichenoides chronica, porokeratotic variant of Grover disease and Fox–Fordyce disease, hamartomas such as porokeratotic eccrine ostial dermal duct nevus, and inherited disorders of the keratinization have been described in association with real cornoid lamellation,3 in addition to a wide spectrum of other skin lesions including scars, viral warts, seborrheic keratosis, milia, solar keratosis, squamous cell carcinoma in situ, and basal cell carcinoma. In these particular

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settings, it has been related to genetic instability resulting from an unidentifiable trigger. LS is a chronic inflammatory dermatosis that results in epidermal atrophy of unknown etiology. Both, genital or extragenital presentations have been described, with a clear predilection for the vulva. First described by Darier,4 LS is defined as a vacuolar interface dermatitis with the presence of homogenized eosinophilic acellular zone within the superficial dermis.5 The association of LS with other epithelial alterations is usually interpreted as secondary. Most commonly, vulvar LS, which is predominantly a pruritic condition, frequently results in a superimposed lichen simplex chronicus and excoriations. Similarly, the presence of atrophy in cutaneous lesions of LS is also a common finding.6 Interestingly, no studies have previously reported the association between LS and cornoid lamellation. This case is the first to describe a plaque of extragenital LS associated with the presence of cornoid lamellas in the margins. We interpret it as an incidental finding secondary to the epithelial alterations occurring in LS; however, genetic instability may play a role in the coincidental manifestation of these lesions. Because the diagnosis of early and evolving lesions of LS without the hallmark sclerosis can be problematic, the purpose of this case is to highlight a new histopathological feature www.amjdermatopathology.com |

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Letters to the Editor

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FIGURE 2. Microscopic findings of the lesion show a slightly atrophic epidermis with hyperkeratosis (A), and dermal sclerosis, with vacuolar interface changes and a light perivascular lymphocytic infiltrate underlying the sclerosis (B). Two tilted cornoid lamellas are seen overlying the lateral edge of the atrophic epidermis (C). An area of dyskeratotic keratinocytes with hypogranulosis is present under the vertical column of parakeratosis (D).

that can overlap with LS and delay its diagnosis. Maria C. Garrido, MD, PhD* Veronica Monsalvez, MD† Jose L. Rodriguez-Peralto, MD, PhD* *Department of Pathology, Hospital Universitario 12 de Octubre, Instituto de Investigación I+12, Facultad de Medicina, Universidad Complutense, Madrid, Spain


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†Department of Dermatology, Hospital Universitario 12 de Octubre, Instituto de Investigación I+12, Madrid, Spain

REFERENCES 1. Wade TR, Ackerman AB. Cornoid lamellation: a histologic reaction pattern. Am J Dermatopathol. 1980;2:5–15. 2. Weedon D. An approach to interpretation of skin biopsies. In: Weedon D, ed. Weedon’s Skin Pathology. 3rd ed. London, United Kingdom: Churchill Livingstone Elsevier; 2010:3–18.

3. Biswas A. Cornoid lamellation revisited: apropos of porokeratosis with emphasis on unusual clinicopathological variants. Am J Dermatopathol. 2015;37:145–155. 4. Darier J. Lichen plan sclereux. Ann Dermatol. 1882;3:833–837. 5. Hewitt J. Histologic criteria for lichen sclerosus of the vulva. J Reprod Med. 1986;31: 781–787. 6. Carlson JA, Lamb P, Malfetano J, et al. Clinicopathologic comparison of vulvar and extragenital lichen sclerosus: histologic variants, evolving lesions, and etiology of 141 cases. Mod Pathol. 1998;11:844–854.

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Copyright Ó 2016 Wolters Kluwer Health, Inc. Unauthorized reproduction of this article is prohibited.

Cornoid Lamellation Associated With Lichen Sclerosus.

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