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Nevus of Hori in African patients: an entity that is most likely underdiagnosed in clinical practice.
Int J Womens Dermatol
March 2025
Private Practice, Pretoria, South Africa.
Background: Nevus of Hori (HN) has been primarily reported in patients of Eastern Asian descent, with a paucity of data regarding HN occurring in African patients. In this study, we report on South African patients with HN initially thought to have melasma.
Objective: To characterize the histopathological and clinical phenotypes of HN in African patients.
In meiosis, one round of DNA replication followed by two rounds of chromosome segregation halves the ploidy of the original cell. Accurate chromosome segregation in meiosis I depends on recombination between homologous chromosomes. Sister centromeres attach to the same spindle pole in this division and only segregate in meiosis II.
View Article and Find Full Text PDFThe human nucleoporin RanBP2/Nup358 interacts with SUMO1-modified RanGAP1 and the SUMO E2 Ubc9 at the nuclear pore complex (NPC) to promote export and disassembly of exportin Crm1/Ran(GTP)/cargo complexes. In mitosis, RanBP2/SUMO1-RanGAP1/Ubc9 remains intact after NPC disassembly and is recruited to kinetochores and mitotic spindles by Crm1 where it contributes to mitotic progression. Interestingly, RanBP2 binds SUMO1-RanGAP1/Ubc9 via motifs that also catalyze SUMO E3 ligase activity.
View Article and Find Full Text PDFPrimary Intracranial Sarcoma, DICER1-Mutant, With Prominent Chondroid Differentiation: Case Report and Summary of Reported Patients in Literature.
Int J Surg Pathol
January 2025
Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.
Primary intracranial sarcoma, -mutant, included as a new diagnostic entity in the 2021 WHO Classification of Central Nervous System Tumors, is a rare, but aggressive neoplasm generally identified in the supratentorial forebrain. The prognostic implications of these uncommon tumors and optimal treatment strategy remain unclear. A 19-year-old woman was found unresponsive after reporting a severe headache.
View Article and Find Full Text PDFHead and Neck Rhabdomyosarcoma in Pediatric Patients: An International Collaborative Study.
J Oral Pathol Med
January 2025
Departamento de Diagnóstico Oral, Área de Semiologia e Patologia Oral, Faculdade de Odontologia de Piracicaba, Universidade Estadual de Campinas (FOP-UNICAMP), Piracicaba, Brazil.
Background: Rhabdomyosarcoma (RMS), a rare malignant tumor, frequently affects pediatric patients, with 35%-40% occurring in the head and neck. This study analyzes the clinicopathologic profile of pediatric head and neck rhabdomyosarcomas from Brazil, Guatemala, Mexico, and South Africa.
Methods: We reviewed 44 cases from 10 Oral and Maxillofacial Pathology services, conducting immunohistochemical analyses of desmin, myogenin, Myo-D1, and Ki67, with quantification via QuPath software.
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