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Updated: Mar 6, 2026

Posterior Approach for Debridement of the Psoas Abscess
Published on: March 2, 2020
Malignant Lymphoma in the Psoas Major Muscle
Nobuhiro Akuzawa1, Takashi Hatori2, Aya Takase3
1Department of General Medicine, National Hospital Organization Shibukawa Medical Center, 383 Shiroi, Shibukawa, Gunma 377-0280, Japan.
Abstract:
An 84-year-old Japanese man taking warfarin to prevent cerebral infarction secondary to atrial fibrillation was admitted to our hospital for evaluation of a painless right back mass. Magnetic resonance imaging (MRI) showed an oval-shaped mass in the right psoas major muscle. The mass showed high intensity on T1-, T2-, and diffusion-weighted imaging and mimicked an acute-phase hematoma. However, it showed no chronological changes typical of a hematoma, and MRI revealed enlargement of the mass 1 week after admission. Histopathological examination of a biopsy specimen revealed diffuse large B-cell lymphoma (DLBCL). Although skeletal muscle lymphoma is rare, physicians should be familiar with its MRI characteristics. In addition, determination of the lymphoma subtype has important implications for the treatment of skeletal muscle lymphoma because DLCBL may have an especially poor prognosis.
Insights
A rare case of diffuse large B-cell lymphoma (DLBCL) presented as a psoas muscle mass. This lymphoma subtype has a poor prognosis, highlighting the need for accurate MRI diagnosis in skeletal muscle abnormalities.
Area of Science:
- Oncology
- Radiology
- Pathology
Background:
- Skeletal muscle lymphoma is a rare condition.
- Early and accurate diagnosis is crucial for effective treatment.
- Diffuse large B-cell lymphoma (DLBCL) can present atypically.
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