Lesión dermatológica en zona de tatuaje / Dermatological lesion in tattoo area

Los tatuajes representan una situación in vivo única en la que una gran cantidad de sales metálicas y tintes orgánicos permanecen en la piel durante toda la vida. Como resultado de un mayor número de tatuajes realizados, la incidencia de complicaciones cutáneas asociadas a los tatuajes ha aumentado también. En los últimos 30 años se ha evidenciado un aumento de reportes de tumores cutáneos en los tatuajes; sin embargo, muchos autores siguen considerándolo un evento fortuito. Los posibles efectos cancerígenos locales de los tatuajes siguen sin estar claros. Se cree que este efecto podría ser multifactorial y que combina traumatismo de la aguja, inflamación local crónica, factores externos como la exposición a los rayos ultravioleta (UV) y un posible efecto pro-cancerígeno de las tintas. Se necesitan estudios epidemiológicos y clínicos a gran escala para demostrar esta asociación. Se presenta un caso de un hombre de 40 años, conocido sano, quien 2 meses después de tatuarse el hombro derecho, desarrolla una lesión con características clínicas de un queratoacantoma y a quien se le realiza el diagnostico histológico de un carcinoma espinocelular bien diferenciado e invasor.

Tattoos represent a unique in vivo situation where many metallic salts and organic dyes remain on the skin for a lifetime. As a result of a greater number of tattoos performed, the incidence of skin complications associated with tattoos has increased. In addition, in the last 30 years, there has been an increment in reports of skin tumors within tattoos; however, many authors continue to consider it is a coincidental event. The possible local carcinogenic effects of tattoos remain unclear. It is believed that this effect could be multifactorial, combining needle trauma, chronic local inflammation, external factors such as an ultraviolet rays (UV) exposure and a possible pro-cancer effect of the inks. Large-scale epidemiological and clinical studies are needed to demonstrate this association. A case of a known healthy 40-year-old male is presented, in whom 2 months after a tattoo was performed on his right shoulder, he developed a lesion with clinical characteristics of a keratoacanthoma in which the histological diagnosis of a well differentiated and invasive squamous cell carcinoma was made.

Case for diagnosis. A pruritic eruption of keratotic papules over the face and neck

Abstract Generalized eruptive keratoacanthoma of Grzybowski is a rare variant of multiple keratoacanthomas counting with about 40 cases reported. It is a chronic and progressive disease for which none of the described therapeutic options has been entirely satisfactory. We report a case of an 83-year-old female who presented with a 3-month history of extremely pruritic, multiple, skin-coloured to erythematous to brownish, millimetric papules, with a keratotic centre. Histological examination of an incisional biopsy was consistent with the diagnosis of keratoacanthoma. The patient started acitretin 25 milligrams daily with a complete resolution of pruritus and regression of numerous lesions.

Queratoacantoma gigante em paciente com síndrome da imunodeficiência adquirida tratado com cirurgia micrográfica de Mohs / Giant keratoacanthoma in a patient with acquired immunodeficiency syndrome treated with Mohs micrographic surgery

O queratoacantoma (QA), apesar de frequente na prática diária, é um tumor que gera questionamentos. O aspecto mais intrigante associa-se à sua posição no limite entre malignidade e benignidade. A abordagem do tumor, bem como sua classificação, é controversa. Na definição da conduta, é importante levar em conta o potencial de transformação para carcinoma espinocelular. Desse modo, a excisão cirúrgica é a terapia de escolha, sempre que possível. Algumas situações merecem atenção adicional, como a imunossupressão associada. Neste artigo, relatamos um caso de QA gigante em um paciente com síndrome da imunodeficiência adquirida tratado com cirurgia micrográfica de Mohs

Keratoacanthoma (KA), although frequent in clinical practice, is a tumor that raises questions. The most intriguing aspect is associated with its position on the border between malignancy and benignity. The approach to the tumor, as well as its classification, is controversial. When defining the conduct, it is essential to consider the potential for transformation into squamous cell carcinoma. Thus, surgical excision is the therapy of choice, whenever possible. Some cases require additional attention, such as associated immunosuppression. In this article, we report a case of giant KA in a patient with acquired immunodeficiency syndrome treated with Mohs micrographic surgery.

Queratoacantoma tratado con metotrexato intralesional: una alternativa terapéutica efectiva en casos seleccionados / Keratoacanthoma treated with intralesional methotrexate: an effective therapeutic alternative in selected cases

El Queratoacantoma es un carcinoma de células escamosas de rápido crecimiento, cuyo tratamiento definitivo contempla la resección quirúrgica. El manejo se dificulta cuando las condiciones de la lesión implican cirugías extensas o las condiciones del paciente son riesgosas al plantear manejo invasivo. Se propone el uso de Metotrexato intralesional como estrategia terapéutica alternativa al tratamiento quirúrgico tradicional. Se exponen 2 casos en los cuales se usó este método. Primero es una paciente de 91 años con queratoacantoma en región frontal, de rápido crecimiento. Segundo, un paciente de 76 años, en tratamiento anticoagulante, con lesión en cuero cabelludo. Ambos pacientes reciben inyecciones de Metotrexato, las cuales muestran resultados significativos, en cuanto a reducción de tamaño. La inyección intralesional de Metotrexato demuestra utilidad como alternativa terapéutica o como manejo neoadyuvante previo a la cirugía

Keratoacanthoma is a rapidly growing squamous cell carcinoma, which definitive treatment includes surgical resection. Therapy becomes more complex when the lesion requires extensive surgeries or the patient's conditions are risky for invasive management. The use of intralesional methotrexate is proposed as an alternative therapeutic strategy to traditional surgical treatment. Two cases are presented where this method was used. First a 91-year-old patient with rapidly growing keratoacanthoma in the frontal region. Second a 76-year-old patient, undergoing anticoagulant treatment, with a scalp lesion. Methotrexate injections were applied to both patients, with significant lesion size reduction. Intralesional injection of Methotrexate proves useful as a therapeutic alternative or as neoadjuvant management prior to surgery.

The role of p53, Ki-67 and laminin expression in the differential diagnosis of keratoacanthoma and well-differentiated SCC

Introduction: We have aimed to evaluate the difference between the expression of p53, Ki-67, and laminin in keratoacanthoma and well-differentiated SCC (SCC) and to determine its importance in differential diagnosis. Methods: This study totally included 46 cases consisting of 23 cases with keratoacanthoma and 23 with SCC. As well as age, gender, localization, and diameter of the lesion, the expression of p53, Ki-67 and laminin was evaluated. Results: No statistically significant difference was found between KA and well-differentiated SCC in terms of diameter, age, and localization. There was a statistically significant difference between KA and well-differentiated SCC in terms of p53 and Ki-67 staining (P < 0.001). Increased expression of p53 and Ki-67 was found in well-differentiated SCC. A statistically significant correlation was present between the expression of p53 and Ki-67 in KA. A statistically significant difference was detected between KA and well-differentiated SCC in terms of laminin staining (P = 0.018). Increased laminin expression was determined in well-differentiated SCC. Conclusion: We have determined in this study that p53, Ki-67 and laminin may be used as adjuvant immunohistochemical markers in differential diagnosis of KA and well-differentiated SCC.

Eruptive Keratoacanthoma en Plaque Confirmed by Complete Spontaneous Regression: A Case Report and Review of the Literature / 대한피부과학회지

Here we present a case of an unusual variant of keratoacanthoma, eruptive keratoacanthoma en plaque, occurring on the upper lip of a 58-year-old man. The lesion was a flesh-colored nodular plaque measuring 1.5×1.0 cm that rapidly grew within 2 months. After two biopsies, the cutaneous lesion grew more rapidly for 1 month, covering the entire cutaneous surface of the upper lip and measuring 6.0×2.0 cm. Thereafter, it disappeared without any treatment within 3 months, resulting in mild scarring with a cobblestone-like surface similar to the stereotypical involuting course of ordinary keratoacanthoma. In addition to the clinical features, the present case displayed essential diagnostic features of eruptive keratoacanthoma by showing typical spontaneous involution not reported in previous reports. Furthermore, it also revealed histopathology suggestive of squamous cell carcinoma, at least focally in addition to that of keratoacanthoma, which may evoke the potential for a misdiagnosis of malignancy.

Ceratoacantoma: aspectos morfológicos, clínicos e cirúrgicos / Keratoacanthoma: morphological, clinical, and surgical aspects

Introdução: O ceratoacantoma é uma neoplasia epitelial de rápido crescimento, mais frequente em áreas de exposição solar. Habitualmente, apresenta-se como lesão única, arredondada, com depressão central preenchida de queratina. As semelhanças clínicas e histopatológicas com o carcinoma de células escamosas, frequentemente, dificultam o diagnóstico diferencial. A biópsia excisional é a abordagem de escolha, permitindo diagnóstico e tratamento. Método: O presente estudo é observacional e retrospectivo, com dados de 162 pacientes tratados de 2005 a 2013, no Hospital Felício Rocho, em Belo Horizonte, MG. Todos os pacientes submeteram-se à excisão cirúrgica dos tumores. Foram estudados: sexo, idade, número de lesões, localização, tamanho do tumor e diagnóstico pré-operatório. Resultados: Dos 162 pacientes, totalizando 173 lesões, 154 (95,06%) apresentavam ceratoacantoma único. Noventa e dois eram do gênero masculino (56,80%) e 70 do feminino (43,20%). A idade dos pacientes variou de 11 a 96 anos, com média de 71,23 anos. As lesões localizavam-se predominantemente nos membros superiores (43,64%), na face (28,48%) e nos membros inferiores (17,58%). Nas hipóteses diagnósticas formuladas pelos cirurgiões, no pedido do exame anatomopatológico, houve diagnóstico correto em 63,13%. Conclusão: O ceratoacantoma é uma neoplasia epitelial de características morfológicas semelhantes ao carcinoma de células escamosas, o que, por muitas vezes, dificulta o diagnóstico. Torna-se necessária, portanto, a excisão cirúrgica completa das lesões suspeitas para diagnóstico e tratamento corretos.

Introduction: Keratoacanthoma is an epithelial neoplasm of rapid growth, more frequent in areas of sun exposure, and usually appears as a single, rounded lesion with a central depression filled with keratin. Clinical and histopathological similarities with squamous cell carcinoma often make differential diagnosis difficult. Excisional biopsy is the approach of choice, allowing diagnosis and treatment. Method: This is an observational and retrospective study, in which data of 162 patients treated at the Hospital Felício Rocho from 2005 to 2013, in Belo Horizonte, MG, were analyzed. All patients underwent surgical excision of tumors. Data on sex, age, number of lesions, location, tumor size, and preoperative diagnosis were studied. Results: Of the 162 patients, with a total of 173 lesions, only 154 (95.06%) had keratoacanthoma. There were 92 male (56.80%) and 70 female (43.20%) patients. The age of patients ranged from 11 to 96 years, with an average of 71.23 years. The lesions were located predominantly in the upper limbs (43.64%), face (28.48%), and lower limbs (17.58%). In the diagnostic hypotheses formulated by surgeons at the request of the pathology, the diagnosis was correct in 63.13%. Conclusion: Keratoacanthoma is an epithelial tumor with morphological characteristics similar to those of squamous cell carcinoma, which often complicates the diagnosis. Therefore, the complete excision of the suspicious lesions is necessary for correct diagnosis and treatment.

Various Skin Tumors Originating from Disseminated Superficial Actinic Porokeratosis / 대한피부과학회지

Disseminated superficial actinic porokeratosis (DSAP) is a rare keratinization disorder. It is histopathologically characterized by the presence of coronoid lamellae and clinically by lesions showing central atrophy with elevated borders. Squamous cell carcinoma originating in the classical Mibelli subtype of porokeratosis is well-documented; however, few reports have described squamous cell carcinoma in DSAP lesions. We report the case of a 76-year-old woman with DSAP who developed Bowen's disease, actinic keratosis, and keratoacanthoma on her face.

Progress in the mechanisms of keratoacanthoma regression / 实用肿瘤学杂志

Keratoacanthoma ( KA) is an epithelial neoplasm occurring in sun -exposed skin of the elder-ly.Two striking features of KA are its clinical behavior with spontaneous regression after rapid growth and its nos -ological position on the border between benignity and malignancy .The regression of KA may be associated with the hair follicle cycle,apoptosis and immune function of organism .This article summarizes physiological mecha-nisms such as Wnt/retinoic acid signalling cross -talk,the function of p53,bcl-2,bcl-xL and bak in apopto-sis,and the mechanism of action of several immune -related cells,that drives KA regression .It can provide theo-retical basis for us to select the method as well as time of the treatment in KA .

A Case of Squamous Cell Carcinoma Occurred in the External Auditory Canal Misdiagnosed as a Keratoacanthoma after Radiotherapy for Kimura's Disease / 대한이비인후과학회지

Malignancy of the external auditory canal (EAC) is a rare tumor. Among the malignancies of EAC, squamous cell carcinoma (SCC) is the most common pathologic type. The causes of SCC of EAC may be exposure to ultraviolet rays, cholesteatoma, chronic otitis externa, and rarely radiotherapy. SCC of EAC has the diverse and non-specific clinical features including mass of tissue, otorrhea, otalgia, tinnitus, and facial palsy which make it difficult to distinguish between SCC and benign tumor. Recently, we experienced a case of SCC of EAC occurred in the left external auditory canal after radiotherapy for Kimura's disease, which was misdiagnosed as keratoacanthoma at first. The findings of this case suggest that when it is difficult to distinguish SCC from benign tumor of EAC, the excisional biopsy including enough resected margin and base of tumor is needed for an exact diagnosis.

Reconstruction of surgical defect of the dorsum of the hand

Abstract In some cases, keratoacanthomas can be indistinguishable from squamous cell carcinoma, making the gold standard treatment surgical excision with histopathological evaluation. The surgical defects created on the back of the hand can be challenging to repair. We describe the use of bilateral rotation flap as an option in this area, and discuss the indications and contraindications of some of the possible surgical techniques for reconstruction of the dorsum of the hand.

Multiple Giant Keratoacanthoma Treated with Acitretin / 대한피부과학회지

Giant keratoacanthoma is an uncommon variant of keratoacanthoma, which may increase to a diameter of several centimeters. Although keratoacanthomas usually resolve spontaneously, giant keratoacanthoma can be invasive and destructive. A 49-year-old man presented with a 5-year history of multiple large hyperkeratotic and crusted plaques and nodules on sun-exposed areas such as the face, ear, hand, and forearm. Some lesions involuted spontaneously, whereas others became rather enlarged. The biopsy specimen revealed horn-filled crater formation, epidermal extending resembling a buttress, and an eosinophilic glassy appearance in the keratinocytic cytoplasm. We treated the lesions with acitretin, and they almost completely resolved after 13 weeks. Here we describe a case of multiple giant keratoacanthoma treated with acitretin.

Keratoacanthoma of the conjunctiva in a young patient / Ceratoacantoma da conjuntiva em um paciente jovem

ABSTRACT Keratoacanthomas rarely occur in the conjunctiva. We report a case of a 24-year-old man with a rapidly growing conjunctival mass. The tumor was excised with a safety margin to exclude squamous cell carcinoma and was histopathologically diagnosed as a keratoacanthoma. There has been no recurrence over 2 years of follow-up. To the best of our knowledge, he is the youngest patient to be diagnosed with conjunctival keratoacanthoma who had no known risk factors such as skin disorders, trauma, surgery, or infection. In similar cases, we recommend complete early surgical excision and careful follow-up to exclude malignancy.

RESUMO Ceratoacantoma raramente ocorre na conjuntiva. Nós relatamos o caso de um homem de 24 anos de idade, com uma massa conjuntival de rápido crescimento. O tumor foi retirado com uma margem de segurança para excluir carcinoma de células escamosas. Ele foi diagnosticado histopatologicamente como sendo ceratoacantoma. Não houve recidiva em dois anos de seguimento. Ele é o paciente mais jovem com ceratoacantoma conjuntival que não tinham fatores de risco conhecidos como doenças de pele a ser descrito. Em casos semelhantes, recomendamos excisão cirúrgica precoce completo e um acompanhamento cuidadoso para excluir malignidade.

Queratoacantoma subungueal: A propósito de un caso / Subungual keratoacanthoma: A case report

El queratoacantoma subungueal es una variante infrecuente, no involutiva y localmente destructiva de queratoacantoma, se presenta con cierta predilección en los tres primeros dedos de la mano y con mayor frecuencia en pacientes caucásicos varones, generalmente en la quinta década de la vida. La causa aún es desconocida y se observa con mayor frecuencia en pacientes con incontinencia pigmenti, como una manifestación tardía de ésta. Comunicamos el caso de una paciente con incontinencia pigmenti, quien presenta una lesión en pulgar derecho compatible con un queratoacantoma subungueal. Este tumor se caracteriza por su difícil diagnóstico, por lo que éste debe basarse en la correlación de los hallazgos clínicos, radiológicos e histopatológicos. Es importante realizar el diagnóstico diferencial con el carcinoma escamoso invasor subungueal, ya que, difieren en el tratamiento, siendo el segundo más agresivo y merecedor de un tratamiento radical, a diferencia del queratoacantoma que puede tener un manejo más conservador, a pesar que es solo una variante clínica del carcinoma espinocelular, tal como lo es la enfermedad de Bowen o el carcinoma verrugoso, para nombrar solo a dos.

Subungual keratoacanthoma is a rare and uncommon variant of keratoacanthoma. It shows a locally aggressive behavior, and spontaneous regression is infrequently. The tumour usually occurs on the fifth decade of male caucasian patients, with predilection for the first three fingers of the hand. The cause is still unknown, and occurs more frequently in patients with incontinentia pigmenti and is considered a late manifestation of the disease. We report a patient’s case with incontinentia pigmenti, who has a lesion in her right thumb, compatible with a subungual keratoacanthoma. This tumour is known for being difficult to diagnose, so it must be based on correlation of clinical, radiological and histopathological findings. It is crucial to make the differential diagnosis with subungual invasive squamous cell carcinoma, as they differ in treatment, since the latter has an aggressive behavior and needs radical treatment, while the handling of the keratoacanthoma might be conservative.

Queratoacantoma de vulva: presentación de un caso / Vulvar keratoacanthoma: presentation of a case

El queratoacantoma de vulva es una entidad rara que podría presentar confusión en su diagnóstico con el carcinoma bien diferenciado de células escamosas. Presentamos un caso de una paciente con diagnóstico de queratoacantoma de vulva tratada con resección quirúrgica de la lesión y su seguimiento posterior.

Vulvar keratoacanthoma is a rare disease that may present confusion in diagnosis with well differentiated squamous cell carcinoma. We report one patient with vulvar keratoacanthoma, treated by resection surgery of the lesion and her outcome.

Multiple giant angiokeratoma of Fordyce on the shaft of the penis masquerading as keratoacanthoma

The term 'angiokeratoma' includes a wide range of dermatological conditions of hyperkeratotic vascular disorders with a similar histologic combination of hyperkeratosis and superficial dermal vascular ectasia. Angiokeratomas can be classified into localized and systemic forms. Angiokeratoma of Fordyce (AKF) is a localized form of angiokeratoma, clinically characterized by 1- to 6-mm, black, blue, or dark red, dome-shaped papules located on the scrotum, shaft of penis, labia majora, clitoris, inner thigh, and lower abdomen. We describe herein a case of giant angiokeratoma of Fordyce on shaft of the penis in an elderly man, clinically masquerading as keratoacanthoma.

A case of Muir-Torre syndrome presenting as keratoacanthoma and sebaceous adenoma / 中华皮肤科杂志

A 44-year-old male presented with a neoplasm on the buccal side of the right nasolabial fold for more than two months.Dermatological examination showed a hemispherical bulge sized 1.5 cm × 1.5 cm with central crater-like ulceration on the buccal side of the right nasolabial fold,as well as a crescent-shaped elevation measuring 1.5 cm × 2.5 cm above the hemispherical lesion.Histopathology of the hemispherical lesion revealed irregularly downward proliferation of epidermis,crater-like holes filled with eosinophilic keratinous plug in the center which were surrounded by collar-shaped epithelial cell projections.Small neutrophil abscesses were found in the clumps of epithelial cells,and massive lymphocyte infiltration with a clear bottom boundary was observed around the proliferating epithelial cells.Histopathologic examination of the crescent lesion showed multiple irregularly-shaped lobular-like structures of various sizes with sebaceous glands at different degrees of maturity in the mid dermis,which were surrounded by proliferating connective tissue.Immunohistochemical studies showed that the squamous cells stained positive for cytokeratin (CK),CK5,CK14,CK17,carcinoembryonic antigen (CEA) and epithelial membrane antigen (EMA) in the keratoacanthoma,and the sebaceous cells for CK,CK5,CK14 and EMA in the sebaceous adenoma.The pathological diagnosis was keratoacanthoma and sebaceous adenoma.The patient was diagnosed with moderately and poorly differentiated rectal adenocarcinoma in 2008.A diagnosis of Muir-Torre syndrome presenting as keratoacanthoma and sebaceous adenoma was finally made.

The research on exprse sion of ec ll cycle and apop tosis relaet d protein in keratoaac nthoma and well-dif-ferentiated squamous cell carcinoma / 实用肿瘤学杂志

Objective To explore the expressions and significances of p 53、bcl-2、Ki-67 and apopto-sis in keratoacanthoma(KA)and well differentiated squamous cell carcinoma (WDSCC).Methods The expres-sions of p53、bcl-2、Ki-67 were detected by immunohistochemical technique in 44 cases of KA and 20 cases of WDSCC.Apoptosis was identified by using terminal deoxynucleotidyl transfers ( TdT) -mediated dUTP -biotin nick and labelling(TUNEL)method.Results The positive expressive rates of p53 in proliferative、mature and re-gressive of KA were 22.23%、26.18% and 6.52%, which was lower than the positive rate of WDSCC (41.82%).Significant differences were found between every period of KA with WDSCC in p 53 expression;The intensity of expression and pattern were similar in KA of Ki -67 and p53.There were a positive correlation be-tween p53 and Ki-67 expression rate(r=0.986,P<0.001).The bcl-2 staining showed weak expression in 1 case in WDSCC and 2 cases in KA ,but only a few positive tumor cells was limited to basal cell layer in KA .The average apoptosis rate in KA was 21.72%,which was apparently higher than in WDSCC (9.925%).There were a negative correlation between the apoptosis rate and proliferation rate of Ki -67(r=-0.824,P<0.001).Con-clusion The proliferation and apoptosis in KA can coexist .However ,the apoptosis will occupy a dominance posi-tion in regressive phase ,which results in the regression of tumor .The expressions of p53、Ki-67 and apoptosis would be a certain significance in differentiated KA and WDSCC .

A Clinicohistopathologic Study of a Lesion Resembling Keratoacanthoma / 대한피부과학회지

BACKGROUND: Keratoacanthoma (KA) can be clinically differentiated with ease from other dermatoses. However, the differential diagnosis of KA can sometimes be difficult, and some cases clinically suggest that the results of skin biopsies of lesions thought to be KA indicate other diseases. OBJECTIVE: The purpose of this study is to examine the diagnostic yield in submitting clinically diagnosed KA that showed solitary symmetric, firm, erythematous, or skin-colored nodules. METHODS: We retrospectively reviewed the clinical records of 54 patients with a clinical diagnosis or differential diagnosis of KA who received biopsies and visited the department of dermatology from January 2004 to December 2013. We compared clinical and histopathologic diagnoses and analyzed the rate of concurrence. In addition, clinical features, including age, sex, location, and duration were investigated. RESULTS: Of the patients, 40.7% were clinically diagnosed with KA, but the results of the histopathology tests indicated other diseases. The mean age of the patients with KA was 72.8 years, and the ratio of men to women was 1 : 0.92. Of the new patients, 0.07% had KA, and most of the lesion sites (84.0%) were caused by sun exposure. Other diseases that are more common in patients with KA are squamous cell carcinoma (55.2%), basal cell carcinoma (20.7%), seborrheic keratosis (6.9%), verruca vulgaris (6.9%), pyogenic granuloma (3.4%), clear cell acanthoma (3.4%), and Bowen's disease (3.4%). CONCLUSION: Skin lesions thought to be KA need more examinations, and skin biopsies of appearances of clinically atypical lesions that cannot completely exclude the possibility of precancerous or malignant lesions are strongly recommended.