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Keeping it real: Merging traditional and contemporary practices in musculoskeletal pathology: A special issue of neoplastic and non-neoplastic bone and soft tissue pathology.
Human Pathology 2024 March 30
There is no shortage of comprehensive review articles on bone and soft tissue pathology, almost always representing a regurgitation of the literature with little to no guidance on personal "best practices," recommended applications of ancillary testing, and alternative points of view. This special issue of Human Pathology uniquely unites evidence-based medicine, where appropriate, with the collective personal experiences of a wide range of accomplished pathologists from varying institutions and backgrounds, addressing problematic areas, updated and sometimes imperfect classification systems, and their personal preferences for cost-effectively incorporating ancillary testing. For the preponderance of general pathologists (and specialists), whether academic or non-academic, non-neoplastic musculoskeletal diseases represent a far higher percentage of their practice than bone and soft tissue neoplasia. One of the most common frozen sections performed at many hospitals throughout the USA is revision arthroplasty, relying on the pathologist to help determine the presence (or absence) of periprosthetic joint infection, largely based on the hematoxylin & eosin (H&E) slide. Not every institution has access to the latest molecular techniques; fortunately, many of the current immunohistochemical antibodies serve as reliable surrogate markers of genetic mutations, allowing for cheaper but accurate diagnoses, when deemed necessary. Furthermore, molecular testing is often not necessary to establish a specific diagnosis, even among neoplasms with known underlying genetic abnormalities. It must be remembered that most bone and soft tissue tumors were recognized and classified correctly, before we uncovered and understood, among a subset, their underlying and unique molecular aberrations. Perhaps not surprisingly, in some cases, more than one molecular pathway may lead to the same histologic tumor subtype. Less commonly, an identical genetic driver/fusion may result in immunophenotypically and biologically distinct neoplasms, sometimes with entirely different clinical behaviors. "Dedifferentiation," a concept recognized among a variety of bone and soft tissue neoplasms, including but not limited to chondrosarcoma, parosteal osteosarcoma, and liposarcoma, needs to be objectively reassessed, particularly for liposarcoma. The following reviews attempt to address the above concepts, re-emphasizing the important role the practicing pathologist continues to (and must) play in the differential diagnoses of neoplastic and non-neoplastic musculoskeletal diseases.
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