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Intramuscular myxoma

Case contributed by Ammar Haouimi
Diagnosis almost certain


Progressive painless swelling of the anterolateral aspect of the left upper leg.

Patient Data

Age: 30 years
Gender: Female

Large well-circumscribed intramuscular soft tissue mass within the tibialis anterior muscle. It appears hypointense to the muscles on T1 with a peripheral rim of fatty signal, hyperintense on T2 and STIR with a vivid heterogeneous enhancement on postcontrast sequences. No extension to the adjacent muscles. Normal appearance of the adjacent tibial and fibular cortex.

Case Discussion

MRI features of a well-circumscribed intramuscular mass within the tibialis muscle with no extension to the adjacent soft tissues.

The patient went on to have surgical resection of the tumor with a histopathological exam that confirmed the diagnosis of an intramuscular myxoma.

Intramuscular myxomas are a rare benign type of soft tissue myxoma that is mesenchymal in origin. Most frequently diagnosed in females (~57%) patients between 40-70 years.

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