Dermoscopy of haemosiderotic/aneurysmal dermatofibroma: A morphological study of 110 cases.

Background: Haemosiderotic and aneurysmal dermatofibromas are uncommon and frequently misdiagnosed lesions, which can be considered as different histopathological stages of the same tumour. A dermoscopic diagnosis testing accuracy has not been performed for these tumours to date.

Objectives: To determine the diagnostic significance of dermoscopic structures and patterns associated with haemosiderotic/ aneurysmal dermatofibromas in a large series.

Dermoscopy of inflamed seborrheic keratosis: A great mimic of malignancy.

Background: Clinical and dermoscopic recognition of seborrheic keratoses (SKs) is often straightforward, and biopsy might not be required. However, inflamed SKs (iSKs) can pose a diagnostic challenge. Dermoscopic features of iSKs have not yet been evaluated to date.

Dermatoscopy of nodular/plaque-type primary cutaneous T- and B-cell lymphomas: A retrospective comparative study with pseudolymphomas and tumoral/inflammatory mimickers by the International Dermoscopy Society.

Background: Limited data on dermatoscopy of nodular/plaque-type T-/B-cell primary cutaneous lymphomas (PCLs) is available.

Objective: To describe dermatoscopic features of nodular/plaque-type PCLs, comparing them with those of clinical mimickers (pseudolymphomas, tumors, and inflammatory lesions) and investigating possible differences according to histologic subtypes.

Methods: Participants were invited to join this retrospective, multicenter case-control study by submitting histologically/immunohistochemically confirmed instances of nodular/plaque-type PCLs and controls.

Clear Cell Proliferations of the Skin: A Histopathologic Review.

Cutaneous clear cell proliferations encompass a heterogenous group of several primary cutaneous neoplasms and metastatic tumors with different histogenesis. Many of these clear cell proliferations may seem strikingly similar under the microscope resulting in challenging diagnosis. In many of these clear cell lesions, the reason for the clear or pale appearance of proliferating cells is unknown, whereas in other ones, this clear cell appearance is due to intracytoplasmic accumulation of glycogen, mucin, or lipid.

The Usefulness of Dermoscopy for the Recognition of Malignant Collision Tumors.

Background: Preoperative diagnosis of malignant collision tumors (MCT) is extremely difficult. The value of dermoscopy to improve the correct detection of these tumors has not been previously studied. This study aims to evaluate the diagnostic accuracy of MCT with and without dermoscopy and to describe the dermoscopic features of a large series of MCT.

Incidence of Melanoma in Catalonia, Spain, Is Rapidly Increasing in the Elderly Population. A Multicentric Cohort Study.

The incidence of melanoma has been increasing worldwide during recent decades. The objective of the study was to analyse the trends in incidence for in situ and invasive melanoma in the Spanish region of Catalonia during the period of 2008-2017. We designed a cross-sectional study with an age-period-cohort analysis of melanoma patient data from the Network of Melanoma Centres in Catalonia.

Heterogeneity in the linear shiny white structures in melanomas seen with polarized light according to histopathological association: Cross-sectional observational study in 118 cutaneous melanomas.

Polarized dermoscopy enables visualization of linear shiny white structures in melanomas, thought to be due to the existence of fibrosis in the dermis. Our objective was to establish the existence of two types of linear shiny white structures and assess their association with different histological structures. We performed a cross-sectional study including all non-acral, non-facial melanomas from our hospital with linear shiny white structures.

Increasing incidence of lentigo maligna and lentigo maligna melanoma in Catalonia.

Background: Recent epidemiological studies suggest that past data where superficial spreading melanoma was by far the most common subtype of melanoma may not reflect current patterns of sun exposure or other risk factors more involved in other subtypes of melanoma as lentigo maligna (LM) or lentigo maligna melanoma (LMM).

Methods: In order to measure the current situation in our country, all cases of LM and LMM diagnosed in 23 hospitals in Catalonia, from 2000 to 2007, were recorded.

Results: Although for the global period LM/LMM represented only 8.

Dermoscopy of lipidised dermatofibroma: A morphological study of 13 cases.

Background/objectives: The aim of this study was to evaluate the morphological findings of lipidised dermatofibromas under dermoscopic observation.

Methods: Dermoscopic examination of 13 cases of lipidised dermatofibromas was performed to evaluate specific dermoscopic criteria and patterns.

Results: The most frequently occurring dermoscopic features were as follows: (i) A yellowish homogenous pigmentation in all cases (100%); this pigmentation was total in 30.

Dermoscopy of Adnexal Tumors.

Cutaneous adnexal tumors include lesions with apocrine, eccrine, follicular, sebaceous, and mixed differentiation. Most are benign and sporadic, although malignant forms are occasionally observed and some cases develop in the setting of inherited syndromes. These tumors often cause immense diagnostic difficulty.

Dermoscopy of chondrodermatitis nodularis helicis.

Chondrodermatitis nodularis helicis (CNH) is a benign auricular disease whose differentiation with nonpigmented tumors is mandatory. Clinical characteristics of CNH are well known, but there is no information about the dermoscopic features that could help differentiate CNH from squamous cell carcinoma and other non-melanoma skin cancers. To describe the dermoscopic appearance of CNH and to formulate a differential diagnostic model, we conducted  a retrospective, single center, observational dermoscopic study on a sample of 189 biopsy-proven lesions: 25 CNH; 26 squamous cell carcinomas; 62 basal cell carcinomas and 76 other benign and malignant tumors.

Dermoscopy of arteriovenous tumour: A morphological study of 39 cases.

Background/objectives: Arteriovenous tumour is a distinct, benign, acquired vascular lesion that can be misdiagnosed.

Methods: A dermoscopic examination of 39 cases of arteriovenous tumours collected from four Spanish hospitals was performed to evaluate specific dermoscopic criteria and patterns.

Results: The most common structures found were vascular, 95% of cases (37/39); 90% (35/39) were non-arborising telangiectasia.

Dermoscopy of lymphangioma circumscriptum: A morphological study of 45 cases.

Background/objectives: The dermoscopy of lymphangioma circumscriptum, also known as superficial lymphatic malformation, remains to be clarified.

Methods: Digital dermoscopic images of 45 histopathologically confirmed cases of lymphangioma circumscriptum collected from nine hospitals in Spain, Italy and Turkey were evaluated for the presence of dermoscopic structures and patterns.

Results: Our study shows that the most common structure found in lymphangioma circumscriptum was the presence of lacunae (89% of cases).

Dermoscopic Clues for Diagnosing Melanomas That Resemble Seborrheic Keratosis.

Importance: Melanomas that clinically mimic seborrheic keratosis (SK) can delay diagnosis and adequate treatment. However, little is known about the value of dermoscopy in recognizing these difficult-to-diagnose melanomas.

Objective: To describe the dermoscopic features of SK-like melanomas to understand their clinical morphology.

Dermoscopy of Nodular Hidradenoma, a Great Masquerader: A Morphological Study of 28 Cases.

Background: Nodular hidradenoma is an uncommon, benign, adnexal neoplasm of apocrine origin which is a clinical simulator of other tumours.

Objective: The aim of this study was to evaluate the morphological findings of a large series of nodular hidradenomas under dermoscopic observation.

Methods: Dermoscopic examination of 28 cases of nodular hidradenomas was performed to evaluate specific dermoscopic criteria and patterns.

Clinical and dermoscopic features of atypical Spitz tumors: A multicenter, retrospective, case-control study.

Background: Few studies have described the clinical and dermoscopic features of atypical Spitz tumors.

Objective: We sought to describe the clinical and dermoscopic features of a series of atypical Spitz tumors as compared with those of conventional Spitz nevi.

Methods: This was a multicenter, retrospective, case-control study, analyzing the clinical and dermoscopic characteristics of 55 atypical Spitz tumors and 110 Spitz nevi that were excised and diagnosed histopathologically.

Melanoma incidence increases in the elderly of Catalonia but not in the younger population: effect of prevention or consequence of immigration?

All cases of MM diagnosed in 23 hospitals in Catalonia, from 2000 to 2007 were recorded and melanoma incidence calculated and adjusted for the European standard population via the direct method. The age standardised rate/100,000 inhabitants varied from 6.74 in 2000 to 8.

Dermoscopic evaluation of nodular melanoma.

Importance: Nodular melanoma (NM) is a rapidly progressing potentially lethal skin tumor for which early diagnosis is critical.

Objective: To determine the dermoscopy features of NM.

Design: Eighty-three cases of NM, 134 of invasive non-NM, 115 of nodular benign melanocytic tumors, and 135 of nodular nonmelanocytic tumors were scored for dermoscopy features using modified and previously described methods.

Studying regression of seborrheic keratosis in lichenoid keratosis with sequential dermoscopy imaging.

Background: Lichenoid keratosis (LK) is a well-described entity that has been proposed to represent a regressive response to a pre-existent epidermal lesion.

Aims: To evaluate the natural evolution of a series of cases showing the intermediate stage of the regression of seborrheic keratosis in LK using sequential dermoscopy imaging over time.

Material And Methods: A series of lesions with dermoscopic areas of seborrheic keratosis and LK in the same tumor were consecutively collected for over 3 years at the Dermatology Department of the Hospital de Sant Pau i Santa Tecla, Tarragona, Spain.

Pyogenic granuloma clinically and dermoscopically mimicking pigmented melanoma.

Pyogenic granuloma is a common, benign, acquired, vascular growth of skin and mucous membranes that usually presents as a solitary, rapidly, growing, papule or polyp that bleeds easily after minor trauma. The clinical diagnosis of this lesion is usually straightforward. Moreover, the dermoscopic features associated with pyogenic granulomas have been described recently.