RESUMO
Mammary Paget's disease (MPD) is a rare histological condition, accounting for 1-4% of female breast cancers, which may appear either independently (1.4-13% of the cases), or in association with an in situ or invasive ductal carcinoma (approximately 90% of the cases). The purpose of this article is to highlight the histopathological challenges related to the microscopical polymorphism of this disease and the utmost importance of immunohistochemistry in the thorough process of Paget's disease differential diagnosis. Moreover, the primary objective of this review of literature was to corroborate the existing data concerning the potential peculiar immunohistochemical profile that mammary Paget's disease might express. We report the case of a 44-year-old female patient, histopathologically diagnosed with HER2-negative MPD accompanying an invasive mammary carcinoma. The histopathological and immunohistochemical approach is derived from the exigency of excluding the possibility of synchronous tumors-a mammary invasive carcinoma, accompanied by another component with MPD phenotypic mimicry. The unexpected negative HER2 reaction is conducted to a primary focus on excluding a malignant melanoma in situ. The absence of MelanA and S100 immunoexpression and lack of pigmentation and clinical aspects infirmed it. Bowen's disease was invalidated by its rare presentation in the breast cutaneous tissue and the absence of individual risk factors suggestive of an existing immunosuppressive status. In the case of similar morphoimmunohistochemical aspects, significant expression of Ki-67 signals MPD, an immunoreactivity that helped distinguish the cellular population from Toker cells. The great similarity of MPD with other benign and malignant cutaneous tumors might determine delay or misdiagnosis. Thus, the utmost importance of immunohistochemistry is reflected in its prognostic significance and geared towards extending the therapeutic arsenal.
RESUMO
(1) Background: A malignant gastrointestinal neuroectodermal tumor (GNET) is an ultra-rare primary neoplasm with a distinctive histopathological, immunohistochemical, molecular, and ultramicroscopic profile, synonymous terminology with clear cell sarcoma-like tumor of the gastrointestinal tract. This case report aims to describe a case of GNET with challenging mesenchymal, lymphoid, and melanic tumor differential diagnosis. (2) Case presentation: We discuss the case of a 67-year-old male patient who presented with diffuse abdominal pain, intermittent lack of intestinal transit, and frequent episodes of nausea, followed by segmental resection of the jejunum and sigmoid colon. The patient had no relevant medical history. The surgical specimen underwent immunohistochemical staining and morphological evaluation. (3) Results: Histopathological analysis reveals a moderately homogeneous polyhedral-epithelioid and spindle cell neoplastic proliferation with a zonal discohesive pattern and extensive and focal fasciculated architecture. Twenty monoclonal antibodies were used for immunostaining, which allowed GNET to be diagnosed on the basis of the tumoral immune profile, characterized by positive reactivity of S100, SOX10, and CD 56. (4) Conclusions: The poor prognosis of GNET is highlighted in the present study, along with the vital importance of differential diagnosis issues with mesenchymal, lymphoid, and melanic tumors, which make the diagnosis difficult for both pathologists and clinicians.
RESUMO
BACKGROUND: In the contemporary era, people are extracting medical information from content-sharing means on the Internet, and the most popular virtual platforms authorize users to access knowledge, guidance, and exchange opinions. Doctors have massively joined online communities and developed educational accounts to meet the informational necessities of general users. The aim of the current study is to identify the role of social media in augmenting the awareness of melanoma. METHODS: For this observational study, questionnaires were disseminated to the general population over eight weeks consecutively, through online channels, represented by Facebook (Meta Platforms, Inc., Menlo Park, California, United States) and Instagram (Meta Platforms, Inc., Menlo Park, California, United States), to extract qualitative data related to the relationship between social media, the epidemiological variables, and melanoma-associated/sun protection behaviors. The inclusion criteria comprised constant Facebook and Instagram users, aged between 18-65. RESULTS: The study included 221 individuals, primarily aged 26 to 35 (47.1%), mostly females (77.82%). Urban dwellers (>200,000 inhabitants) constituted the majority (71.94%), contrasting with a small rural representation (3.61%). Nearly half actively followed medical educational content online (44.79%), while 12.66% avoided online medical advice. Sun-protective habits were prevalent, with 80.99% using SPF (sun protection factor), 54.29% wearing UV-filter (ultraviolet-filter) sunglasses, and 53.84% avoiding sun exposure between 10 AM and 4 PM. Respondents rated sun-protective measures, with the highest average for avoiding sun exposure during peak hours being 7.3 on a scale of 1 to 10. Dermatological advice from social media influenced behaviors, such as SPF use (50.67%) and sun exposure avoidance (45.7%). Dermatological check-ups were infrequent, with 49.32% sporadically visiting a dermatologist. Dermoscopic evaluations were rare (36.66%), with 27.14% using it preventively. Personal and family history of dysplastic nevi and melanoma were low. CONCLUSIONS: This study provides insights into the dermatological behaviors and education of individuals engaging with social media medical content. The results suggest that constant users of social media harbor a receptive attitude toward dermatological advice provided on specific platforms, hence creating an ideal environment for further dissemination and organization of online skin cancer awareness campaigns.
