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Dermatopathology (Basel, Switzerland) Oct 2022Clear cell acanthoma (CCA) is classically considered a benign epidermal tumor, although rare case reports have described CCA with malignant features. Here, we present a...
Clear cell acanthoma (CCA) is classically considered a benign epidermal tumor, although rare case reports have described CCA with malignant features. Here, we present a case of a patient with a biopsy proven CCA that regrew post-biopsy and was subsequently completely excised. Histologic examination of the tumor in the excision specimen revealed malignant cytologic features that were not present in the initial biopsy. A review of the literature identified five additional cases of CCA with similar malignant cytologic features. On analysis, common histopathologic characteristics included cellular pleomorphism, increased nuclear-to-cytoplasmic ratio, prominent nucleoli, and atypical mitotic figures. We support the designation of atypical clear cell acanthoma for these entities with features of both CCA and significant cytologic atypia. As none of these cases exhibited clinically aggressive behavior, further study is warranted.
PubMed: 36278542
DOI: 10.3390/dermatopathology9040041 -
Dermatopathology (Basel, Switzerland) 2019Epidermolytic acanthoma is a rare benign tumor that appears as a solitary papule or, rarely, multiple small papules on the trunk and extremities, or on genitalia. They...
Epidermolytic acanthoma is a rare benign tumor that appears as a solitary papule or, rarely, multiple small papules on the trunk and extremities, or on genitalia. They are generally asymptomatic, although they can be pruritic. The clinical presentation is often misleading, and the lesions are often misdiagnosed histologically and frequently confused with condyloma acuminatum. Here, we report a case of an epidermolytic acanthoma on the penis of a 57-year-old male, whose final diagnosis was made after several years.
PubMed: 31700841
DOI: 10.1159/000499366 -
The American Journal of Dermatopathology May 2024Onychocytic matricoma (OCM) is a benign neoplasm of the nail matrix. Only 18 cases of this tumor have been reported in the literature to date. We retrospectively...
Onychocytic matricoma (OCM) is a benign neoplasm of the nail matrix. Only 18 cases of this tumor have been reported in the literature to date. We retrospectively analyzed the clinical features of 14 patients with OCM. The most common clinical feature was longitudinal xanthopachyonychia (n = 9), followed by longitudinal leukopachyonychia (=3) and longitudinal pachymelanonychia (n = 2). The most common clinical findings identified following dermoscopy and analysis at high magnification of classical photographs were free-edge thickening of the nail plate without pitting (n = 14), longitudinal ridging (n = 7), round white clods (n = 7), white dots (n = 7), and filiform hemorrhages (n = 7), followed by oval and linear white clods (n = 5), fuzzy lateral border (n = 5), and red-purple blood clods (n = 3). Nail clipping histopathology showed a thickened nail plate with multiple, small, round-to-oval spaces. The tumor expressed immunopositivity for LEF-1. Dermoscopy of the nail plate and nail clipping histology provides useful information with regards to the differential diagnosis with subungual squamous cell carcinoma and nail melanoma. Ex vivo-in vivo correlation facilitates a better dermoscopic assessment of this unique underrecognized disease. However, the differential diagnosis between OCM and onychocytic carcinoma requires biopsy of the tumor. LEF-1 as an onychogenic marker can be used to resolve the differential diagnosis between OCM and subungual longitudinal acanthoma/seborrheic keratosis.
Topics: Humans; Skin Neoplasms; Retrospective Studies; Nail Diseases; Acanthoma; Nails, Malformed; Carcinoma, Squamous Cell; Diagnosis, Differential; Dermoscopy
PubMed: 38513115
DOI: 10.1097/DAD.0000000000002674 -
Dermatopathology (Basel, Switzerland) Feb 2023Post-pemphigus acanthomas have been rarely discussed in the literature. A prior case series identified 47 cases of pemphigus vulgaris and 5 cases of pemphigus foliaceus,...
Post-pemphigus acanthomas have been rarely discussed in the literature. A prior case series identified 47 cases of pemphigus vulgaris and 5 cases of pemphigus foliaceus, out of which 13 developed acanthomata as a part of the healing process. Additionally, a case report by Ohashi et al. reported similar recalcitrant lesions on the trunk of a patient with pemphigus foliaceus being treated with prednisolone, IVIG, plasma exchange, and cyclosporine. Some view post-pemphigus acanthomas as variants of hypertrophic pemphigus vulgaris, being difficult to diagnose when they present as only single lesions, with a clinical differential of an inflamed seborrheic keratosis or squamous cell carcinoma. Here, we present a case of a 52-year-old female with a history of pemphigus vulgaris and four months of only topical therapy (fluocinonide 0.05%) who presented with a painful, hyperkeratotic plaque on the right mid-back that was found to be a post-pemphigus acanthoma.
PubMed: 36810570
DOI: 10.3390/dermatopathology10010012 -
Case Reports in Dermatology 2017Epidermolytic acanthoma (EA) is a benign cutaneous condition. It is characterized by warty or flat-topped, keratotic papules that show epidermolytic hyperkeratosis in...
Epidermolytic acanthoma (EA) is a benign cutaneous condition. It is characterized by warty or flat-topped, keratotic papules that show epidermolytic hyperkeratosis in histology. EA has been described to occur in various locations, namely the trunk, face, and genitoscrotal area. However, it has not been previously reported to involve the palmar area. To the best of our knowledge, we present the first reported case of EA involving the palms and fingers.
PubMed: 28868008
DOI: 10.1159/000478890 -
European Journal of Histochemistry : EJH Jul 2015Sox9 is a master regulatory gene involved in developmental processes, stem cells maintenance and tumorigenesis. This gene is expressed in healthy skin but even in...
Sox9 is a master regulatory gene involved in developmental processes, stem cells maintenance and tumorigenesis. This gene is expressed in healthy skin but even in several skin neoplasms, where its expression patterns often resembles those of the developing hair follicle. In this study, samples from eleven different types of canine skin neoplasms (squamous papilloma, squamous cell carcinoma, infundibular keratinizing acanthoma, inferior tricholemmoma, isthmic tricholemmoma, trichoblastoma, trichoepitelioma, malignant trichoepitelioma, pilomatricoma, subungual keratoacanthoma, subungual squamous cell carcinoma) were immunohistochemically stained and evaluated for Sox9 with the aim to correlate tumor phenotype with molecular characteristics that may help to better define tumor development, contribute to its diagnosis and clinical management. Keratoacanthoma excluded, all the skin neoplasms examined showed a variable positivity to Sox9, especially in the basal layers, but with major intensity in neoplasms developing from the bulge region of the hair follicle, as trichoblastoma. According to our results, Sox9 could be employed as a stem cell marker to better assess the role of stem cells in canine epidermal and follicular tumors.
Topics: Animals; Dog Diseases; Dogs; Gene Expression Regulation, Neoplastic; Humans; Neoplasm Proteins; Neoplasms, Glandular and Epithelial; SOX9 Transcription Factor; Skin Neoplasms
PubMed: 26428883
DOI: 10.4081/ejh.2015.2514 -
Current Health Sciences Journal 2018Clear cell acanthoma is an uncommon, benign lesion, usually present in middle-aged and elderly patients. It looks like an erythematous papule, solitary, with squama at...
Clear cell acanthoma is an uncommon, benign lesion, usually present in middle-aged and elderly patients. It looks like an erythematous papule, solitary, with squama at the periphery, regularly located on the lower limbs. We present the case of an 80-year-old female, who was admitted in the Dermatology Clinic of Craiova for an infiltrative plaque, erythematous-squamous-crusty, well delimited, with sizes 1,2/1,5cm, polycyclic shape, located in the right groin. The onset of the condition was 7-8 years ago, with slow growth in size. The excision of the lesion was performed and the histopathological examination confirmed the diagnosis of clear cell acanthoma. Our case is atypical by location. Because clear cell acanthoma is difficult to be clinically diagnosed, with a wide range of lesions that make a differential diagnosis, we highlight the importance of histopathological examination for a positive diagnosis. The treatment depends on the type of lesion and on the patient's preference, usually consisting in surgical excision.
PubMed: 31123619
DOI: 10.12865/CHSJ.44.04.13 -
Lin Chuang Er Bi Yan Hou Tou Jing Wai... Dec 2020The patient, a 70-year-old woman, presented with a mass in the right nasal cavity accompanied by recurrent nosebleeds for 3 months. Physical examination revealed a mass...
The patient, a 70-year-old woman, presented with a mass in the right nasal cavity accompanied by recurrent nosebleeds for 3 months. Physical examination revealed a mass in the right nasal vestibule, with a diameter of about 1.5 cm. The surface of the mass was not smooth and nasal CT showed a mass in the right nasal vestibule, which could be surgically removed. Immunohistochemical results of the tumor showed CKpan(3+), CK5/6(3+), p40(3+), p53(+), CD10(-), AR(-), Bcl-2(-), ki-67(+20%). Pathological diagnosis was acantholytic dyskeratotic acanthoma. This disease is rare and easy to be misdiagnosed, so it is necessary to pay attention to identification.
Topics: Acanthoma; Aged; Epistaxis; Female; Humans; Immunohistochemistry; Nasal Cavity; Nose Neoplasms; Skin Neoplasms
PubMed: 33254352
DOI: 10.13201/j.issn.2096-7993.2020.12.019 -
Indian Journal of Dermatology Jul 2011The authors report on a case of a 65-year-old man with pigmented clear-cell acanthoma located on the right thigh. Dermoscopy disclosed a peculiar picture consisting of...
The authors report on a case of a 65-year-old man with pigmented clear-cell acanthoma located on the right thigh. Dermoscopy disclosed a peculiar picture consisting of diffuse black pigmentation with a superficial greyish veil in the central portion, dotted-to-globular dark red-black structures mainly located at the periphery with a homogenous regular reticular arrangement; peripheral translucid desquamation. Dermoscopic features are correlated with the histology, where hemosiderin deposits present in a sheet-like arrangement in the perivascular papillary dermis and in a band-like disposition in the reticular dermis at the base of the lesion can account for the pigmented picture. The lesion arose on a trauma-prone skin site; thus the authors believe that traumatic irritation may be responsible for the clinical and dermoscopic pictures, giving rise to a reaction similar in a way to the Auspitz's sign provocated by trauma for psoriasis. Red blood cells extravasation from extremely superficialized capillaries may have led to hemosiderin deposition in the papillary and the reticular dermis.
PubMed: 21965855
DOI: 10.4103/0019-5154.84749 -
Anais Brasileiros de Dermatologia 2021
Topics: Acanthoma; Dermoscopy; Humans; Skin Neoplasms
PubMed: 34006397
DOI: 10.1016/j.abd.2020.06.027