Intramuscular myxoma of the deltoid muscle in a swimmer: A rare case report and literature review

Adamonis, Saulius; Enodien, Bassey; Taha‐Mehlitz, Stephanie; Maurer, Andreas; Taha, Anas

doi:10.1002/ccr3.2483

Cited by 7 publications

(9 citation statements)

References 10 publications

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“…Adamonis et al (2019) also reported the presence of IMM in the deltoid muscle in a 34-year-old man, whose tumor lesion was observed in T2-weighted images with hyperintense appearance. In histopathological evaluation, after observing spindle-stellate fibroblast cells in mucoid background with scattered collagen fibers of deltoid IMM was confirmed (5). In the present case, the mass has a thin capsule around the homogenous hypocellular mucoid tissue, in which the spindle-shaped cells (fibroblasts) are located in scattered collagen fibers.…”

Section: Discussionsupporting

confidence: 67%

“…From a diagnostic point of view, IMM is observed as a non-calcified mass in plain radiograph, which is seen in the supplementary findings with the help of ultrasonography as echogenic cystic lesions among the muscle tissue. The most important diagnostic method of IMM from other soft tissue lesions is magnetic resonance imaging (MRI), which can be seen as hypointense homogeneous mass in T1-weighted sections and hyperintense in T2-weighted sections (5). In case of edema with IMM in MRI sections (T1-weighted sections), it should be differentiated from other fluid-containing lesions (such as cystic teratoma, hematoma, myxoid sarcoma, cystic hygroma and even normal lymph nodes).…”

Section: Introductionmentioning

confidence: 99%

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Rare forearm intramuscular myxoma: a case report

Pirmohamadi

Begloo

Rahimi

et al. 2023

Preprint

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Rare forearm intramuscular myxoma: a case report

Pirmohamadi

Begloo

Rahimi

et al. 2023

Preprint

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“…Even in cases with a radiological suspicion of an IMM, the histological diagnosis confirmation should be accelerated. As our evaluation demonstrated, in many cases, IMMs resemble soft tissue sarcomas and cannot always be differentiated, even by experienced musculoskeletal surgeons [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

Diagnostic and Therapeutic Pathways of Intramuscular Myxoma

et al. 2022

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Intramuscular myxomas (IMMs) are benign tumors. Evidence regarding diagnostic and therapeutic pathways is rare, and guidelines do not exist due to their low incidence. The aim of this study was a retrospective analysis at a university cancer center and the interdisciplinary re-evaluation of the individual diagnostic and therapeutic procedures. Overall, 38 patients were included in the study. IMMs occurred mostly in middle-aged women. At the time of first consultation, 57.9% had few symptoms or were asymptomatic. In 92.1% of the cases, the tumor was localized in the extremities. The lower extremity was affected in 73.7%. The average size of IMMs was 5.0 cm. The proximally located tumors in the gluteus, thighs, and upper arms were significantly larger (p = 0.02) than the distally-located tumors in the forearms and lower legs. An MRI was performed in 97.4%. Based on imaging, an IMM was suspected in 5.6% by radiologists and in 54.1% by musculoskeletal surgeons. An incision biopsy was performed in 68.4% and led in 100.0% to the right histopathological diagnosis. In total, 89.5% of IMMs were resected. Postoperative complications requiring revision occurred in 8.8%. Recurrences or degenerations of IMMs were not reported in any of these cases.

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“…Intramuscular myxomas predominantly occur in large skeletal muscles of the thighs but less so in the buttocks, calves, shoulders, cervical region, and para-spinal muscles of the back [ 3 ]. We found fewer than a dozen published cases of intramuscular myxomas of the deltoid muscle [ 10 – 16 ]. They usually present as asymptomatic slowly enlarging masses incidentally found on imaging studies but can also present with pain depending on the extent of compression of adjacent structures.…”

Section: Discussionmentioning

confidence: 99%

A 73-Year-Old Man with an Incidental Diagnosis of Deltoid Intramuscular Myxoma Following a History of Trauma

et al. 2022

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Patient: Male, 73-year-old Final Diagnosis: Intramuscular myxoma Symptoms: Shoulder pain Medication:— Clinical Procedure: — Specialty: General and Internal Medicine • Orthopedics and Traumatology Objective: Rare disease Background: Intramuscular myxomas are rare and benign soft-tissue tumors of uncertain differentiation. Predisposing or precipitating factors have not yet been reported. Activating mutation in GNAS (exons 8 and 9) is detected in >90% of sporadic cases. The role of chronic myopathy, tendinopathy, or trauma to muscles in the etiology of these neoplasms is not known. We report an unusual case of a deltoid mass found following longstanding rotator cuff tendinopathy and a recent fall, later confirmed to be an intramuscular myxoma on biopsy. Case Report: A 73-year-old man with a 5-year history of left shoulder pain and rotator cuff tear presented with intractable pain in his left shoulder after a recent fall at home. Physical examination was suggestive of a rotator cuff injury and magnetic resonance imaging (MRI) of the left shoulder revealed a 2.7×2.5×3.7cm T1 hypo- and T2 hyperin-tense oblong mass-like signal abnormality with heterogeneous, predominantly peripheral enhancement within the deltoid muscle concerning for a malignant mass. Surgical resection was carried out along with left reverse total shoulder replacement, and histopathology revealed findings consistent with an intramuscular myxoma. Conclusions: Intramuscular myxomas are rare, benign tumors. This case report presents one such myxoma incidentally found in a patient with longstanding rotator cuff tendinopathy and a recent fall. Although this co-occurrence is likely incidental, further research and case series review of similar presentations may influence postulations of the pathophysiology of myxomas.

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Intramuscular myxoma of the deltoid muscle in a swimmer: A rare case report and literature review

Cited by 7 publications

References 10 publications

Rare forearm intramuscular myxoma: a case report

Rare forearm intramuscular myxoma: a case report

Diagnostic and Therapeutic Pathways of Intramuscular Myxoma

A 73-Year-Old Man with an Incidental Diagnosis of Deltoid Intramuscular Myxoma Following a History of Trauma

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