Intramuscular Myxoma

Aka: Intramuscular Myxoma, Myxoma

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II. Definitions

  1. Myxoma
    1. Benign, lobulated tumor of connective tissue
    2. Composed of spindle and stellate cells within a mucoid matrix (myxoid stroma)
  2. Intramuscular Myxoma
    1. Myxomas involving large Muscles of thigh, buttocks, Shoulder, or upper arm

III. Epidemiology

  1. Intramuscular Myxoma are rare (account for only 0.12% of soft tissue tumors)
  2. Intramuscular Myxoma peak Incidence is in age 40 to 70 years old

IV. Signs

  1. Intramuscular Myxoma is a palpable mass within the large Muscles of thigh, buttocks, Shoulder, or upper arm
    1. Most common in the hip

V. Imaging

  1. MRI
    1. Intramuscular Myxoma is T1 hypointense to Muscle, and T2 high signal intensity

VI. Management

  1. Surgical excision of Intramuscular Myxomas

VII. References

  1. Achar (2022) Am Fam Physician 105(6): 602-12 [PubMed]

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