sex cord tumour with annular tubules sex cord tumour with annular tubules sex cord tumour with annular tubules (sctat) is a rare ovarian tumour in the sex cord group of gonadal tumours. sex cord tumour with annular tubulesother namessex cord tumor with annular tubulesmicrograph of a sex cord tumour with annular tubules. h&e stain.specialtygynecology pathology these tumours may be seen in the context of peutz–jeghers 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. intermediate magnification high magnification prognosis generally, they are considered to be benign; however, occasional malignant cases are reported.