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At least 19 recordsLinked to original sources
PubMed1993

Immunohistochemistry detects differences between lichen planus-like keratosis, lichen planus, and lichenoid actinic keratosis.

Lichen planus-like keratosis (LPLK) (benign lichenoid keratosis) is a common skin lesion that shows some morphologic features of lichen planus (LP) and lichenoid actinic keratosis (LAK). To try to detect differences among these three entities, immunohistochemical staining for S100 protein and HLA-DR (with the antibody LN3) was performed in 31 cases of LPLK, 26 of LAK, and 25 of LP. Langerhans cells (LC) were counted per linear mm of epidermis in the S100 and LN3 slides. With anti-S100 staining, LP cases showed higher numbers of LC (mean = 25.3, SE = 2.84, median = 21.2) than did LPLK (mean = 17.3, SE = 2.26, median = 14.5) and LAK (mean = 9.7, SE = 1.5, median = 5.4). With LN3 stains, LP cases also showed higher numbers of LC than did LPLK and LAK. These results suggest that the involvement of LC in the production of lesions may be different in these three entities. However, due to the overlap in distribution of values observed, the use of these stains does not allow a definite diagnosis to be made exclusively based on the number of LC.

Adult↗
PubMed2004

A comparison of dermoscopic features among lentigo senilis/initial seborrheic keratosis, seborrheic keratosis, lentigo maligna and lentigo maligna melanoma on the face.

Clinical differentiation of facial lentigo senilis/initial seborrheic keratosis (LS/ISK), seborrheic keratosis (SK), lentigo maligna (LM), and lentigo maligna melanoma (LMM) can be difficult. Dermoscopy improves the diagnoses in pigmented skin lesions (PSLs), but it is not helpful for the sun-exposed face because of the flat rete ridges without network-derived features. Therefore, development of new diagnostic criteria for this particular localization is a current issue of dermatology. In this retrospective study, dermoscopic slides of facial pigmented skin lesions of 66 patients referred to two clinics in Turkey were evaluated. Our aim was to determine the reliability of dermoscopy in the differentiation of these entities. The facial PSLs of 66 patients (34 males and 32 females) (median age: 58.2) were photographed with a Dermaphot (Heine, Hersching, Germany) over a five year period from November of 1995 to May of 2000. All of the dermoscopic slides were analysed according to 27 dermoscopic criteria developed by Schiffner et al. This data set contained 22 histologically proven malignant (14 LM, 8 early LMM) and 44 benign (18 SK, 26 LS/ISK) PSLs. In general, asymmetric pigmented follicular openings, dark streaks, slate-gray streaks, dark globules, slate-gray globules, dark dots, dark rhomboidal structures, light brown rhomboidal structures, dark homogeneous areas and dark pseudonetworks were statistically significant for malignant growth. On the other hand, milia-like cysts, pseudofollicular openings, cerebriform structures, light brown globules, light brown dots, light brown homogeneous areas, yellow opaque homogeneous areas, and light brown pseudonetworks were statistically significant for benign growth. This research emphasizes that dermoscopic features on the face differ from criteria used in other locations of the body. Analysis of the data suggests that dermoscopy can be used in the differentiation of LS/ISK, SK, LM and LMM from each other.

Color↗
PubMed1990

Hereditary palmoplantar keratosis of the Gamborg Nielsen type. Clinical and ultrastructural characteristics of a new type of autosomal recessive palmoplantar keratosis.

A new kind of diffuse palmoplantar keratoderma with autosomal recessive inheritance and without associated symptoms was described in Norrbotten, Sweden by Gamborg Nielsen in 1985. Clinically, it ranges between the less severe dominant Unna-Thost type and the more severe recessive Meleda type, as it is milder than the latter. Skin biopsies of five patients from three different families with this new palmoplantar keratoderma, as well as five obligatory heterozygotes from one family, were investigated ultrastructurally in order to characterize this new entity and to differentiate it from the Meleda type. Several features are common to both autosomal recessive palmoplantar keratoses. They show a broadened granular layer, a transit region consisting of cells with a marginal envelope, and considerable hyperkeratosis. Morphologically, this transformation delay is less pronounced in the Gamborg Nielsen type than in the classical Meleda type. As is typical for ridged skin, both types of palmoplantar keratoses possess composite keratohyaline granules. In contrast to the normal appearance of keratohyaline granules in the Meleda type, the Gamborg Nielsen type also shows qualitative deviations of keratohyaline granules with different degrees of spongiosity and electron density and sometimes with a granular border. It seems that abnormal keratohyaline proteins are synthesized that behave differently. The sudden transformation of a granular into a horny cell is physiologically regulated by different enzymes. A delay in this process may be caused by a mutation that reduces or alters the enzymes concerned. We assume the palmoplantar keratoderma of the Gamborg Nielsen type to be a variant of the heterogeneous group of the Meleda type of palmoplantar keratoderma with autosomal recessive inheritance.

Female↗
PubMedDate not supplied

[Environmental and occupational risk factors in keratosis of the larynx].

Laryngeal keratosis may frequently precede the appearance of carcinoma of the larynx which might well indicate that these diseases have a common denominator. A retrospective study of 120 subjects with laryngeal keratosis was examined. The intention of the Authors was to verify whether the principle risk factors involved in the appearance of laryngeal carcinoma were the same as those implicated in laryngeal keratosis formation. Sex age, work activity, cigarette smoke, alcohol consumption and vocal chord abuse were considered. Laryngeal keratosis takes keratosis with dysplasia as well as keratosis without. A link between these two types of keratosis and cancer was sought. In particular, the possibility that a persistent action of the mentioned risk factors could cause laryngeal dysplasia-free keratosis to change into dysplastic lesions and subsequently into cancer was investigated. A case-control study was performed in order to analyze the importance of work activity. Results were statistically significant (P < 0.001). The Cramer V2 calculation demonstrated a clear correlation between the number of cigarettes smoked and the appearance of dysplasia (V2 = 0.117; P < 0.005). Results showed a clearly different behaviour between sexes. The number of males was much higher than females as was the age at which keratosis appeared greater in males. The fact that the average age in which keratosis appeared preceded the appearance of laryngeal cancer by ten years indicates that this interrum is sufficient for keratosis with dysplasia to be transformed into cancer (due to the continued action of the mentioned etiologic factors, mainly referred to cigarette smoke). In our data analysis, no correlation was demonstrated between keratosis without dysplasia and cancer.

Adolescent↗
PubMed1994

The relationship between basal cell epithelioma and seborrheic keratosis. A study of 60 cases.

BACKGROUND: Various skin tumors can be seen rarely in association with seborrheic keratosis. We present 60 cases of seborrheic keratosis related to a basal cell epithelioma in the same specimen. OBJECTIVE: To report association of basal cell epithelioma with seborrheic keratosis and discuss the possibility of malignant change in seborrheic keratosis. METHODS: Sixty cases of seborrheic keratosis associated with basal cell epithelioma were studied. Tissues were fixed in neutral buffered formalin, processed, and stained with standard hematoxylin and eosin techniques. RESULTS: Histological evaluation showed a seborrheic keratosis associated with basal cell epithelioma in all of the cases. Basal cell epithelioma was attached with seborrheic keratosis in a majority of the cases (40/60) and appeared to represent a part of the same tumor. Both tumors were lying adjacent to each other in the rest of the cases (20/60). CONCLUSION: Malignant change in seborrheic keratosis is controversial. We recommend the histological evaluation of seborrheic keratosis especially when inflamed or atypical in appearance. This should not be taken as a mandate for pathological evaluation or for treatment of every seborrheic keratosis as though it was potentially malignant.

Adult↗
PubMed2002

Prevalence of melanoma clinically resembling seborrheic keratosis: analysis of 9204 cases.

OBJECTIVE: To estimate the prevalence of melanoma clinically mimicking seborrheic keratosis. DESIGN: Retrospective review of cases submitted for histological examination with a clinical diagnosis of seborrheic keratosis or with a differential diagnosis that included seborrheic keratosis. SETTING: A tertiary medical care center-based dermatopathology laboratory serving academic dermatology clinics that have a busy pigmented lesion clinic. MATERIALS AND METHODS: A total of 9204 consecutive pathology reports containing a diagnosis of seborrheic keratosis in the clinical information field were identified between the years 1992 and 2001 through a computer database search. Reports with a final histological diagnosis of melanoma were selected for further review and clinicopathological analysis. MAIN OUTCOME MEASURE: Histological diagnosis, which was correlated with the preoperative clinical diagnosis. RESULTS: Melanoma was identified in 61 cases (0.66%) submitted for histological examination with a clinical diagnosis that included seborrheic keratosis. Melanoma was in the clinical differential diagnosis of 31 cases (51%). The remaining lesions had a differential diagnosis of seborrheic keratosis vs melanocytic nevus (17 cases, 28%), basal cell carcinoma (7 cases, 12%), or a squamous proliferation (3 cases, 5%). In 3 cases (5%), seborrheic keratosis was the only clinical diagnosis. All histological types of melanoma were represented. CONCLUSIONS: Our results confirm that melanoma can mimic seborrheic keratosis. These data strongly support the current policy of submitting for histological examination all specimens that have been removed from patients.

Adult↗