Benign Cutaneous Tumors Research Articles

Clear (Pale ) Cell Acanthoma

A 36-year-old gentleman presented to the Dermatology and Venereology outpatient clinic with a painless nodule of the volar aspect of the left forearm for six months (Panel A). On examination, there was a single, non-tender, smooth surface, and dome-shaped nodule. It was shiny with a reddish rim at its periphery. The nodule was excised completely as a treatment and for histopathological examination that shows it as a clear cell acanthoma (CCA) [panel B (H/E-4X) and C (H/E-10X)]. CCA is a rare benign cutaneous tumor of unknown cause. It is mostly presented as a painless, solitary, slowly growing, and pink-brown or red nodule that is seen mostly on the distal lower extremities of middle-aged and elderly patients. Multiple lesions and different morphologies such as polypoid, giant, atypical, pigmented, and cystic lesions can be seen. Other sites like the abdomen, areola, face, and scrotum can be affected. CCA has specific dermoscopic features in which the blood vessels are arranged in a string-like appearance, but the diagnosis is rarely done without biopsy. Histopathological examination reveals epidermal acanthosis with a psoriasiform pattern of pale keratinocytes and spongiosis in association with dilated blood vessels of the edematous dermal papillae. CCA is treated by surgery such as excision, CO2 laser, or cryosurgery. With a weekly regular follow-up of the patient for two months, the lesion was completely cured.

A Retrospective Study of Demographic, Clinical, and Histopathological Profiles of Cutaneous Tumors

Background: In 2007, skin cancers were third most common malignancies in Indonesia. However, profile of cutaneous tumors in our institution has not been studied. Purpose: To evaluate profile of cutaneous tumors in Dermatology and Venerology Outpatient Clinic, Dr. Soetomo General Hospital, Surabaya, Indonesia. Methods: This is a descriptive retrospective study. Inclusion criteria was new cutaneous tumor patients. Exclusion criteria was incomplete data. Medical record and photograph database from 2019-2020 were assessed for demography, clinical features, histopathological examination and final diagnosis. Results: There were 379 (5,5%) cutaneous tumors among 6896 new patients at Dermatology and Venereology Outpatient Clinic. Overall, there were more female patients (53.7%) and age group of 0-45 years old (70.4%). Cutaneous tumors more commonly presented as papular (50.4%), multiple (56.5%), nonpigmented (58.3%), asymptomatic lesions (62.5%), with time from onset 0-24 months (66.2%) and location on head and face (61.2%). Benign cutaneous tumors showed similar findings. Malignant cutaneous tumors showed differences including predominantly male sex, age above 45 years old, nodular, solitary, pigmented and easily bleeding lesions. Malignant tumors were less common (6.9%). Most common malignant tumor was BCC. Most common benign and overall cutaneous tumor was seborrheic keratosis. Conclusion: Cutaneous tumors presented across gender and ages, showing heterogenous clinical manifestations. Malignant and benign cutaneous tumors showed similarity on time from onset and location of lesions. However, differences were seen in demographic profiles and majority of clinical features. BCC was the most common malignant cutaneous tumors, while seborrheic keratosis was the most common benign and overall cutaneous tumors.

Pilomatricoma-overshadowed by the Shadow Cells: A Case Report and Review of Literature

Pilomatricoma is relatively an uncommon benign cutaneous neoplasm predominantly in the first two decades of life. It is often misdiagnosed by non-dermatologists due to a lack of knowledge about this tumour. However, it can be easily diagnosed by a pathologist if classical histopathological features are present. We are presenting this case as there were varied microscopical findings that posed a diagnostic challenge to us.

Top applications of dermatologic ultrasonography that can modify management.

Dermatologic ultrasonography is a new field that has been growing exponentially in the last 10 years. It has multiple applications that can modify patient management, such as the assessment of benign and malignant cutaneous tumors, vascular anomalies, inflammatory dermatologic entities, aesthetic complications, and nail lesions. Compared with other imaging techniques such as computed tomography or magnetic resonance imaging, ultrasonography has the highest axial spatial resolution and has benefited from the development of high- and ultra-high-frequency probes that could even reach 70 MHz. The daily use of ultrasonography in dermatology has been reported to improve the accuracy of diagnoses, the tracking of activity, and the assessment of severity in common dermatologic conditions, which certainly can support better treatment of patients.

Fine needle aspiration cytopathology of eccrine spiradenoma.

Eccrine spiradenoma (ES) is a rare benign cutaneous adnexal tumor. The aim of our study was to discuss the clinical presentation, cytomorphologic features, and differential diagnosis of a series of 3 cases of ES diagnosed by fine needle aspiration (FNA). The pathology databases were searched for cases of ES diagnosed by FNA and confirmed by follow-up surgical excision. FNA smears, cell blocks, and histologic sections were examined. Three cases of ES that had presented as a soft tissue mass from 3 patients were reviewed. The sites included the left forearm, left leg, and left ankle. Cytology smears showed the presence of hypercellular 3-dimensional dense cell clusters and smaller loose cell aggregates, single cells, and bare nuclei. Most cells had round to oval nuclei, scant cytoplasm, and indistinct cell borders. A second population of cells had more spindled nuclei and were often dispersed as single cells. Scattered lymphocytes were present. Two cases showed the presence of pseudo-rosettes composed of hyaline globules of basement membrane-like material with a surrounding row of basaloid cells. None of the cases showed cytologic atypia, necrosis, or mitoses. Immunohistochemistry was used in 2 cases and showed positive staining with myoepithelial markers (smooth muscle actin, calponin, S100, and CK5). The cytology diagnoses were ES, basaloid cutaneous adnexal neoplasm, and suspicious for ES. FNA cytopathology of ES demonstrated banal basaloid and spindle cells, lymphocytes, and infrequent metachromatic-stained hyaline globules. A specific diagnosis requires immunohistochemistry testing to avoid confusion with other cutaneous basaloid neoplasms.

Dermoscopy of glomus tumour: a cross‐sectional study of 86 cases

Glomus tumours (GTs) are benign cutaneous neoplasms derived from the neuromyoarterial apparatus with a strong predilection for acral sites, especially the subungual space. Current data regarding dermoscopy of these lesions are very limited. To analyse the dermoscopic structures and patterns seen in a large series of subungual (SUGTs) and extraungual glomus tumours (EUGTs) and to determine their diagnostic significance. Clinical and dermoscopic images of 86 histopathologically proven cases of GTs (47 SUGTs and 39 EUGTs) collected from 9 hospitals in Spain, France, Italy, and Brazil were evaluated for the presence of dermoscopic structures and patterns. Similarly, 189 and 185 dermoscopic images of other ungual tumours and other extraungual non-pigmented tumours, respectively, were evaluated for the same structures and patterns. Finally, we evaluate diagnostic testing accuracy calculating sensitivity (S), specificity (Sp), and positive and negative predictive values of the different patterns for the diagnosis of GT. Regarding SUGTs, four patterns were built from the combination of different structures. The pattern composed of a structureless purplish/red subungual spot with or without vessels reached the highest S (S1, 78.8%). The combination of a structureless purplish/red subungual spot and longitudinal erythronychia (LE) (S2) is highly specific (96.3%). Patterns S3 (proximal purplish/red subungual spot, LE, and distal notch) and S4 (bed subungual spot and onycholysis) are the most specific and exclusive of matrix and bed tumours, respectively. The most consistent pattern in EUGTs is composed of a structureless purplish-white to reddish-white homogeneous area and linear unfocused vessels (E) (S: 61.5%, Sp: 95.7%). EUGTs did not show lacunae, unlike other vascular tumours. Dermoscopy is helpful in improving the diagnostic accuracy of GTs, not only in SUGTs but also when these lesions arise out of the ungual apparatus.

MAML2 Gene Rearrangement Occurs in Nearly All Hidradenomas: A Reappraisal in a Series of 20 Cases.

Hidradenoma is a benign cutaneous adnexal neoplasm that occurs across a wide age range and at a variety of anatomic sites. Its most characteristic morphologic feature is the presence of diverse cell types including squamoid, clear, plasmacytoid, and mucinous cells. Hidradenoma is morphologically and molecularly similar to mucoepidermoid carcinoma, and both tumors are characterized by recurrent CRTC1-MAML2 cytogenetic translocations. Previous studies have suggested that approximately half of hidradenomas possess this translocation. This finding raised the question of whether translocation-negative hidradenomas might have an alternate molecular basis. Here, we sought to reevaluate the frequency of MAML2 translocation in hidradenoma in a series of 20 cases. We find that 90% show evidence of MAML2 translocation, suggesting that this genetic event is a nearly invariant feature of hidradenoma. These results inform our molecular understanding of this tumor and may be useful in challenging cases to distinguish hidradenoma from its histologic mimics.

Dermoscopy of De Novo Syringocystadenoma Papilliferum

Syringocystadenoma papilliferum is a uncommon benign cutaneous tumor seen to arise from the pluripotent cells with the potential to exhibit either apocrine or eccrine lineage. We report the dermoscopic features of a case of de novo syringocystadenoma papilliferum. Clinically the lesion was characterised by a nodular and crusted surface. Dermoscopically, yellowish-white structures were the prevalent feature.

Poroid Hidradenoma over Dorsum of the Hand

Poroid hidradenoma is a rare, benign cutaneous neoplasm which presents as a solitary swelling. It has eccrine differentiation with features of both hidradenoma and poroma. We hereby present a case of a 50-year-old female patient with a slowly growing asymptomatic lesion over the dorsum of the left hand for 1½ years. Histopathology was consistent with poroid hidradenoma. The hidradenoma component consists of solid and cystic areas and poroma by poroid and cuticular cells. There was no recurrence of the lesion after 1 year of follow-up. Very few cases of poroid hidradenoma have been reported in the literature.

101 Superficial angiomyxoma of the vulva

Superficial angiomyxomas (SAMs) are rare, benign cutaneous tumors frequently involving the subcutis. Only 15 cases of SAM involving the vulva have been reported, ranging from 0.9 to 4 cm in diameter. It is a rare benign cutaneous tumor of soft tissue composed of prominent myxoid matrix and many blood vessels. Superficial angiomyxomas arise more commonly in males, with a peak incidence in the 4th decade of life. In females, they are commonly found in the reproductive age group. This is a case of a 2-year-old child presenting with a mass on the right labia majora approximately 1.5 × 1.3 cm palpable solid mass, tender to touch.

Top Advances in Dermatologic Ultrasound.

The advances in dermatologic ultrasound have been significantly influenced by the development of high- and ultrahigh-frequency probes, the provision of guidelines for performing the examinations, and a growing number of publications in the field. This review analyzes the most significant contributions that have impacted the daily practice of dermatologists in recent years. This includes the advances in anatomical detection and the patterns of benign and malignant cutaneous tumors, inflammatory dermatologic conditions, vascular anomalies, nail abnormalities, and aesthetic procedures. The knowledge of these advances is a primer for the operators of these examinations.

Dermal Duct Tumor: A Diagnostic Dilemma.

Poromas or poroid tumors are a group of rare, benign cutaneous neoplasms derived from the terminal eccrine or apocrine sweat gland duct. There are four poroma variants with overlapping features: dermal duct tumor (DDT), eccrine poroma, hidroacanthoma simplex, and poroid hidradenoma, of which DDT is the least common. Clinically, the variants have a nonspecific appearance and present as solitary dome-shaped papules, plaques, or nodules. They can be indistinguishable from each other and a multitude of differential diagnoses, necessitating a better understanding of the characteristics that make the diagnosis of poroid neoplasms. However, there remains a paucity of information on these lesions, especially DDTs, given their infrequent occurrence. Herein, we review the literature on DDTs with an emphasis on epidemiology, pathogenesis, clinical features, diagnosis, and management.

The most common benign cutaneous neoplasms of vascular, muscular, and adipose tissue and their treatment

Benign cutaneous vascular and cutaneous neoplasms arising from muscle or adipose tissue are rare. Their definition and classification are still controversially discussed. Histopathological and immunohistochemical studies, together with the new genetic tests, contribute significantly to the correct description of the various benign neoplasms of cutaneous origin. Clarifying whether a lesion is benign is fundamental for prognosis and therapeutic management. In most cases, surgical excision is the treatment of choice. Dermatologists should be familiar with the classifications of the most common benign cutaneous neoplasms of vascular, muscular, and adipose tissue and be able to recommend the procedures currently used for an accurate diagnosis. Ensuring that a lesion is benign and a good surgical outcome are essential for the patient.

The most common benign cutaneous neoplasms of the epidermis and appendages and their treatment

Benign cutaneous neoplasms are well defined histologically with absence of all of the following features: architectural disorder, necrosis, cytologic atypia, and atypical mitotic figures. The clinical appearance of any neoplasm is avery important diagnostic factor. The classification of the lesion determines the therapeutic options. This article summarizes the clinical aspects and treatments of the most common benign tumors of the epidermis and its appendages.

Superficial Angiomyxomas Frequently Demonstrate Loss of Protein Kinase A Regulatory Subunit 1 Alpha Expression: Immunohistochemical Analysis of 29 Cases and Cutaneous Myxoid Neoplasms With Histopathologic Overlap.

Superficial angiomyxomas (SAMs) are benign cutaneous tumors that arise de novo and in the setting of the Carney complex (CC), an autosomal dominant disease with several cutaneous manifestations including lentigines and pigmented epithelioid melanocytomas. Although most SAM do not pose a diagnostic challenge, a subset can demonstrate histopathologic overlap with other myxoid tumors that arise in the skin and subcutis. Traditional immunohistochemical markers are of limited utility when discriminating SAM from histopathologic mimics. Since protein kinase A regulatory subunit 1 alpha (PRKAR1A) genetic alterations underlie most CC cases, we investigated whether SAM demonstrate loss of PRKAR1A protein expression by immunohistochemistry. In our series, 29 SAM, 26 myxofibrosarcoma, 5 myxoid dermatofibrosarcoma protuberans, 11 superficial acral fibromyxomas, and 18 digital mucous cysts were characterized. Of the 29 SAM examined in this study, 1 was associated with documented CC in a 5-year-old girl. SAM tended to arise in adults (mean 49.7 y; range: 5 to 87 y). Loss of PRKAR1A was seen in 55.2% of cases (16/29) and had a male predilection (87.5%, 12/16). PRKAR1A-inactivated SAM demonstrated significant nuclear enlargement (100%, 16/16 vs. 23.1%, 3/13), multinucleation (81.3%, 13/16 vs. 23.1%, 3/13), and presence of neutrophils (43.8%, 7/16 vs. 0%, 0/13). In contrast, PRKAR1A was retained in all cases of myxofibrosarcoma (100%, 26/26), myxoid dermatofibrosarcoma protuberans (100%, 5/5), superficial acral fibromyxomas (100%, 11/11), and digital mucous cyst (100%, 18/18). Taken together, PRKAR1A loss by immunohistochemistry can be used as an adjunctive assay to support the diagnosis of SAM given the high specificity of this staining pattern compared with histopathologic mimics.

Transcriptome Analysis of Large to Giant Congenital Melanocytic Nevus Reveals Cell Cycle Arrest and Immune Evasion: Identifying Potential Targets for Treatment.

Large to giant congenital melanocytic nevus (lgCMN) is a benign cutaneous tumor that develops during embryogenesis. A large number of lgCMN patients are ineligible for surgical treatment; hence, there is an urgent need to develop pharmacological treatments. Clinically, tumorigenesis and progression essentially halt after birth, resulting in the homeostasis of growth arrest and survival. Numerous studies have employed whole-genome or whole-exome sequencing to clarify the etiology of lgCMN; however, transcriptome sequencing of lgCMN is still lacking. Through comprehensive transcriptome analysis, this study elucidated the ongoing regulation and homeostasis of lgCMN and identified potential targets for treatment. Transcriptome sequencing, identification of differentially expressed genes and hub genes, protein–protein network construction, functional enrichment, pathway analysis, and gene annotations were performed in this study. Immunohistochemistry, real-time quantitative PCR, immunocytofluorescence, and cell cycle assays were employed for further validation. The results revealed several intriguing phenomena in lgCMN, including P16-induced cell cycle arrest, antiapoptotic activity, and immune evasion caused by malfunction of tumor antigen processing. The arrested cell cycle in lgCMN is consistent with its phenotype and rare malignant transformation. Antiapoptotic activity and immune evasion might explain how such heterogeneous cells have avoided elimination. Major histocompatibility complex (MHC) class I-mediated tumor antigen processing was the hub pathway that was significantly downregulated in lgCMN, and ITCH, FBXW7, HECW2, and WWP1 were identified as candidate hub genes. In conclusion, our research provides new perspectives for immunotherapy and targeted therapy.

A Case of Tumor of Follicular Infundibulum in Parietal Scalp

Tumor of follicular infundibulum (TFI) is a rare benign cutaneous appendage tumor that does not have characteristic clinical features. It is mainly present in the head, neck, and trunk as a solitary lesion. In particular, TFI typically manifests as a plate-like proliferation with multiple thin epidermal connections comprise of monomorphic cells. TFI do not represent cutaneous characteristics, but have clinical significance because TFI is associated with basal cell carcinoma and Cowden's syndrome. We report a case of TFI in parietal scalp with a review of literatures.

'Rainbow pattern': a dermoscopic sign of invasive melanoma.

The 'rainbow pattern' was initially described as a highly specific dermoscopic feature of Kaposi sarcoma. Since then, it has been reported in many benign and malignant cutaneous tumours, including a few malignant melanomas (MMs). To determine the frequency and presentation of this dermoscopic pattern in primary cutaneous MMs in comparison to other cutaneous tumours. The presence of a rainbow pattern was evaluated in a sample of 1100 dermoscopic images of different melanocytic and nonmelanocytic cutaneous neoplasms. The rainbow pattern was observed in 23 of 245 (9.4%) MM and 44 of 855 (5.1%) non-MM neoplasms. MMs presenting this feature were generally thicker: 82.6% > 1 mm and 43.0% > 2 mm. Compared with non-MMs, rainbow pattern in MMs was more commonly focal (82.7% vs. 36.4% nonfocal, P = 0.001) and associated with > 2 dermoscopic structures associated with MM (100% vs. 9% with fewer, P = 0.001). The rainbow pattern is a dermoscopic sign that can occasionally be observed in invasive MMs. In MMs, this feature is usually associated with other dermoscopic criteria of MM and located in a focal and eccentric area, as opposed to a diffuse and isolated presentation in non-MM neoplasms.

Syringocystadenoma Papilliferum at an Unusual Location: a Case Report

A case of 15year old female presented with lesion over back since childhood, with occasional bleeding and oozing from lesion without any associated systemic complaints. There were multiple verrucous coalescing papules forming plaque with overlying erosion present over left lower back- diagnosed provisionally as angiokeratoma circumscriptum and was biopsied. Histopathology revealed findings consistent with Syringocystadenoma papilliferum. Surgical excision was done and closed with rotation flap. Syringocystadenoma is benign cutaneous adnexal tumor presenting clinically with many morphologies such as warty papules, nodules, plaques with oozing of serous material. Lesion is usually seen in head and neck area in most cases however can also occur on extremities, buttocks, anogenital region. It is characterized by multiple invaginations from skin surface in association with hair follicles lined by cuboidal to columnar epithelium on luminal aspect and myoepithelial cells on outside. There is papillary architecture and dermal ductal component.

Distribution of race and Fitzpatrick skin types in data sets for deep learning in dermatology: A systematic review

Distribution of race and Fitzpatrick skin types in data sets for deep learning in dermatology: A systematic review