Membranous and endochondral ossification processes are insufficient to describe all the aspects observed in the growing skeleton. The presence of chondroid tissue that we have identified by means of all modern histological techniques, including those able to detect the different types of collagen, has also to be explained. Present in the mandibular symphysis of either the human or cat fetuses, chondroid tissue has also been observed in the other parts of the mandible, in the sutural areas of the skull and in all the bones of both axial and appendicular skeleton. The differentiation of the mesenchyme into chondroid tissue could probably be related with mechanical forces exerted simultaneously in opposite directions or with a transient ischemia.
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BMJ Case Rep
January 2025
Pathology and Lab Medicine, AIIMS Jodhpur, Jodhpur, Rajasthan, India.
Myoepithelial tumours are rare and distinct entities with uncertain histogenesis. They occur primarily in major salivary glands and soft tissue around the head and neck. Bony involvement predominantly occurs in facial bones.
View Article and Find Full Text PDFJ Clin Pathol
January 2025
Department of Pathology, National Cancer Center, National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
Aims: Calcified chondroid mesenchymal neoplasm (CCMN) is a recently identified category of soft tissue neoplasms defined by cartilage or cartilaginous matrix formation and gene fusions. Its rarity and similarities to other soft tissue tumours pose diagnostic challenges. This study aims to deepen understanding of CCMN, highlighting molecular pathology's role in diagnosis to reduce misdiagnosis, overdiagnosis and overtreatment.
View Article and Find Full Text PDFHistopathology
December 2024
Department of Pathology and Laboratory Medicine, Cleveland Clinic, Cleveland, Ohio, USA.
Aims: Ossifying fibromyxoid tumour is a rare mesenchymal neoplasm predominantly affecting adults characterised by a multinodular growth pattern and the presence of a fibrous pseudocapsule with areas of ossification. Prompted by the recognition of a non-ossifying ossifying fibromyxoid tumour with lipomatous differentiation which caused diagnostic difficulty, we sought to further explore cases of ossifying fibromyxoid tumour with non-osseous heterologous elements.
Methods And Results: A search of our institutional and consultation archives revealed three additional cases that demonstrated lipomatous components and two cases with cartilaginous differentiation.
Virchows Arch
December 2024
Department of Pathology, The Johns Hopkins University School of Medicine, 401 N Broadway, Weinberg Building 2245, Baltimore, MD, 21231, USA.
Int J Surg Case Rep
December 2024
Department of Dermatology, Faculty of Medicine, University of Aleppo, Aleppo, Syria.
Introduction And Importance: Chondroid syringoma also referred to as a mixed tumor, is a benign and rare tumor originating from apocrine or eccrine sweat glands; it predominantly affects middle-aged men. While fine-needle aspiration cytology can aid in diagnosis, histological confirmation remains essential due to the potential for misdiagnosis.
Case Presentation: A-22-year-old male who presented with a solitary, slow-growing, painless, erythematous nodule on the right nasal wing that had been present for 1 year, which was misdiagnosed as an epidermal cyst.
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