Struma ovarii
Micrograph of a struma ovarii. Characteristic thyroid follicles are seen on the right, and ovarian stroma on the left. H&E stain.
Specialty	Oncology

A struma ovarii (literally: goitre of the ovary) is a rare form of monodermal teratoma that contains mostly thyroid tissue, which may cause hyperthyroidism.^[1]

Despite its name, struma ovarii is not restricted to the ovary.

The vast majority of struma ovarii are benign tumours; however, malignant tumours of this type are found in a small percentage of cases.^[2]

Radiologic findings

The ultrasound features of struma ovarii are nonspecific, but a heterogeneous, predominantly solid mass may be seen. Ultrasound demonstrates a complex appearance with multiple cystic and solid areas, findings that reflect the gross pathologic appearance of the tumor.

Magnetic resonance imaging (MRI) findings may be more characteristic: The cystic spaces demonstrate both high and low signal intensity on T1- and T2-weighted images. Some of the cystic spaces may demonstrate low signal intensity on both T1- and T2-weighted images due to the thick, gelatinous colloid of the struma. No fat is evident in these lesions.^[3]

Additional images

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  Low magnification
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  Higher magnification

See also

• Strumal carcinoid
• Teratoma

References

External links

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