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Case report 829: Intramuscular myxoid chondrosarcoma
C G Whitten1, G Y el-Khoury, J A Benda
1Department of Radiology, University of Iowa, College of Medicine, Iowa City.
Skeletal Radiology
|February 1, 1994
Summary
A painless buttock mass initially suspected as intramuscular myxoma based on imaging was diagnosed as myxoid chondrosarcoma via excisional biopsy. This highlights the importance of surgical biopsy for definitive diagnosis of soft tissue tumors.
Area of Science:
- Oncology
- Radiology
- Pathology
Background:
- Soft tissue tumors can present diagnostic challenges, particularly myxoid neoplasms.
- Magnetic resonance (MR) imaging is crucial for initial assessment but may show variable appearances.
Observation:
- A 61-year-old male presented with a 6-month history of a painless right buttock mass.
- Initial MR imaging suggested a myxoid neoplasm.
- Percutaneous needle biopsy yielded a diagnosis of intramuscular myxoma.
Findings:
- Excisional biopsy revealed the mass to be a myxoid chondrosarcoma, not intramuscular myxoma.
- Myxoid chondrosarcoma of soft tissues can exhibit variable T1-weighted MR imaging characteristics.
- Diagnosis solely on percutaneous needle biopsy can be misleading for intramuscular myxoma.
Implications:
- Emphasizes the need for caution when diagnosing intramuscular myxoma based solely on percutaneous needle biopsy.
- Highlights the variable MR imaging appearance of myxoid chondrosarcoma, necessitating definitive histopathological examination.
- Underscores the importance of excisional biopsy for accurate diagnosis and management of suspected soft tissue neoplasms.