Myxoid uterine leiomyoma is a relatively rare pathological subtype of uterine leiomyomas. It is not to be confused with myxoid degeneration of a uterine leiomyoma which has a related but no identical meaning.
Myxoid leiomyomas contain abundant myxoid material between smooth muscle cells. The lesions are soft and translucent but solid. Large lesions may be clinically malignant even if they do not meet standard criteria for the diagnosis of sarcoma. In these lesions, smooth muscle cells are so widely separated by an abundant myxoid material that mitotic count and cellularity cannot be assessed precisely 1.
Signal characteristics of the myxoid portion include:
- T1: geographic and variable signal dependant on protein content 5
- T2: has high signal intensity
T1 C+ (Gd)
- enhances well except for small foci of mucinous lakes or clefts
- delayed and prolonged enhancement is seen due to the presence of a myxoid stroma
- MRI features can overlap with that of a uterine leiomyosarcoma 5
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- 2. Cruz M, Murakami T, Tsuda K et-al. Myxoid leiomyoma of the uterus: CT and MRI features. Abdom Imaging. 26 (1): 98-101. Abdom Imaging (link) - Pubmed citation
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