Common and plantar warts with trichilemmal keratinization‐like keratinizing process: a possible existence of pseudo‐trichilemmal keratinization

Kimura, Shunji; Komatsu, Takafumi; Ohyama, Katsumi

doi:10.1111/j.1600-0560.1982.tb01077.x

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Inflatncd foci of seborrheic keratoses and viral warts may show keratinization that is not of the normal (epidermoid) type, but which resembles trichilemmal keratinization, and should perhaps best be termed pseudo-trichilemmal keratinization (25,26).…”

Section: Seborrheic Keratoismentioning

confidence: 99%

The benign acanthomas

Brownstein

1985

J Cutan Pathol

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An important, yet neglected, problem in dermatopathology, is the evaluation of the benign acanthomas, the benign tumors of epidermal keratinocytes. The benign acanthomas may be simulated by lesions which are not benign (e.g. actinic keratosis), not tumors (e.g. normal plantar skin), or are not epidermal (e.g. dermatofibroma). In addition to normal (epidermoid) keratinization (e.g., seborrheic keratosis and related conditions), the variants of the benign acanthomas show a wide range of aberrant keratinization, including epidermolytic hyperkeratosis (epidermolytic acanthoma), dyskeratosis (warty dyskeratoma), acantholysis (acantholytic acanthoma), cornoid lamellation (porokeratosis), lichenoid hyperplasia (lichen planus-like keratosis), and absence of keratinization (clear cell acanthoma).

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Section: Seborrheic Keratoismentioning

confidence: 99%

The benign acanthomas

Brownstein

1985

J Cutan Pathol

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“…Because large pale pink cells in CFV were situated more in the upper layer of the epidermis and CFV showed no endophytic proliferation, CFV seems to be different from verruca vulgaris with trichilemmal differentiation (trichilemmoma) described by Ackerman. Some CFV may be old verruca vulgaris lesions because koilocytes are rarely seen in older verruca vulgaris and the local areas of trichilemmal differentiation (pale eosinophilic cells with trichilemmal keratinization) in the epidermis and follicular infundibulum can be seen in old lesions …”

Section: Discussionmentioning

confidence: 99%

“…Some CFV may be old verruca vulgaris lesions because koilocytes are rarely seen in older verruca vulgaris and the local areas of trichilemmal differentiation (pale eosinophilic cells with trichilemmal keratinization) in the epidermis and follicular infundibulum can be seen in old lesions. 4,8 BRAF inhibitor-associated verruca keratosis should be mentioned too, because it also has similar histopathological features. BRAF inhibitor-associated verruca keratosis is characterized by papillomatous growth with hyperkeratosis and parakeratosis, sometimes arranged in columns.…”

Section: Discussionmentioning

confidence: 99%

Clinicopathological study of crateriform verruca: Crateriform epithelial lesions histopathologically distinct from keratoacanthoma

Ogita

Ansai

Misago³

et al. 2016

The Journal of Dermatology

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Keratoacanthoma (KA) is a distinct clinicopathological entity, but it is often confused with other crateriform tumors. This study re-examined the clinicopathological features of 380 crateriform epithelial tumors with a central keratin plug. Seventy-six tumors (20%) had histopathological features that differed from solitary KA and were more verruca-like, and we designated these lesions as crateriform verruca (CFV). We performed clinicopathological re-examination of these neoplasms with a crateriform architecture and epithelial lip-like structures similar to KA, which also displayed histopathological features reminiscent of verruca vulgaris, such as finger-like exophytic projections with hyperkeratosis and acanthosis, focal hypergranulosis and arborization. Clinical data on CFV were also summarized. The main histopathological differences from KA were that CFV showed proliferation of keratinocytes with a similar size and regular arrangement, and the base of CFV was well demarcated without endophytic growth. Interestingly, some CFV were partly composed of epithelial cells with large pink cytoplasm in the upper malpighian layer between papillomatous projections. Furthermore, areas of trichilemmal-like keratinization without formation of the granular layer were seen in some lesions. These types of CFV were hardly distinguishable from KA, unless it is recognized that CFV may contain trichilemmal keratinization-like areas accompanied by large epithelial cells with eosinophilic cytoplasm. We have proposed the term CFV for these verrucous neoplasms to differentiate them from KA.

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“…There is some papillomatosis, but this is particularly prominent in filiform variants (Fig. 513 A similar controversy surrounds the presence of squamous eddies in old warts, and the relationship of these lesions to inverted follicular keratosis (see p. 765). Columns of parakeratosis overlie the papillomatous projections.…”

Section: Histopathology 510mentioning

confidence: 99%

Viral diseases

Weedon

2010

Weedon's Skin Pathology

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Common and plantar warts with trichilemmal keratinization‐like keratinizing process: a possible existence of pseudo‐trichilemmal keratinization

Cited by 12 publications

References 7 publications

The benign acanthomas

The benign acanthomas

Clinicopathological study of crateriform verruca: Crateriform epithelial lesions histopathologically distinct from keratoacanthoma

Viral diseases

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