Sex cord tumour with annular tubules (SCTAT) is a rare ovarian tumour in the sex cord group of gonadal tumours.
These tumours may be seen in the context of PeutzâÂÂJeghers syndrome or be sporadic. Large tumours are more likely to be sporadic. Small incidental tumours are more likely to be syndromic.
It has a distinctive appearance under the microscope, from which it derives its name.
Generally, they are considered to be benign; however, occasional malignant cases are reported.