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Clinical Note |

Intramuscular Myxoma Presenting as a Rare Posterior Neck Mass in a Young Child Case Report and Literature Review

Edwin Ishoo, MD
Arch Otolaryngol Head Neck Surg. 2007;133(4):398-401. doi:10.1001/archotol.133.4.398.
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ABSTRACT

Intramuscular myxoma (IMM) is an uncommon benign tumor that presents as a slow-growing, deep-seated mass confined to the skeletal muscle. Histologically, these lesions most resemble umbilical cord tissue. They are generally found in the proximal thigh, gluteal region, or shoulder girdle and are exceedingly rare neck masses in the pediatric population. These tumors most often present as painless, deep-seated intramuscular masses that may exhibit symptoms of compression of surrounding structures. 1 I report a case of a 22-month-old girl with an IMM in the posterior cervical triangle.

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Figure 1.

Clinical appearance of the posterior cervical mass reveals a 4 × 5-cm firm, fixed mass in the right posterior aspect of the neck with no overlying skin changes.

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Figure 2.

Radiologic views of the intramuscular myxoma. A, Sagittal T1-weighted magnetic resonance image shows an intermediate signal. B, An axial contrast-enhanced computed tomographic view of the neck shows a nonenhancing encapsulated and septated mass within the right trapezius muscle. C, Axial T2-weighted magnetic resonance image shows an increased signal.

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Figure 3.

Histopathologic views of the intramuscular myxoma. A, Gross pathologic features show an encapsulated, lobular mass. B, Photomicrograph at low magnification shows a circumscribed mass with a minimally infiltrative, pushing border and homogeneous, gray-blue appearance (hematoxylin-eosin; original magnification ×10). C, Photomicrograph at higher magnification reveals a myxoid matrix sparsely populated by polygonal mesenchymal cells with a few, thin-walled blood vessels (hematoxylin-eosin; original magnification ×10).

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