Diagnostic Challenge: An Extremely Rare Case of Intra-Articular Myopericytoma of the Knee.

Yoji Shido, Jiro Ichikawa, Mayu Fujihiro, Masanori Wako, Tetsuhiro Hagino, Kojiro Onohara

Abstract read

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Article in Diagnostics (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

6 authors.

Yoji ShidoDepartment of Orthopaedic Surgery, Hamamatsu University School of Medicine, Shizuoka 431-3192, Japan.ORCID 0000-0003-4170-7005

Jiro IchikawaDepartment of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Japan.ORCID 0000-0002-9850-6047

Mayu FujihiroDepartment of Pathology, Hamamatsu University School of Medicine, Shizuoka 431-3192, Japan.

Masanori WakoDepartment of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Japan.

Tetsuhiro HaginoDepartment of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Japan.ORCID 0009-0000-5353-4477

Kojiro OnoharaDepartment of Diagnostic Radiology, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

We report an extremely rare case of intra-articular myopericytoma of the knee. A 66-year-old man presented with a 10-year history of knee pain and a slowly enlarging soft, tender, and elastic mass. Magnetic resonance imaging revealed a well-enhanced intra-articular lesion; however, the findings were nonspecific and raised a broad differential diagnosis of vascular, perivascular, and malignant soft-tissue tumors. Incisional biopsy followed by marginal excision confirmed the diagnosis of myopericytoma. Although typically benign and indolent, myopericytomas can mimic both benign and malignant lesions, necessitating histopathological evaluation. At 5 years after surgery, the patient remained recurrence-free.

Indexed as

differential diagnosisimagingintra-articularmagnetic resonance imagingmyopericytoma

Identifiers

PMID42196915

DOI10.3390/diagnostics16101549

PMCPMC13205972

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