Uterine and extrauterine plexiform tumourlets are sex‐cord‐like tumours with myoid features

Retiform uterine tumours resembling ovarian sex cord tumours. A comparative immunohistochemical study with retiform structures of the female genital tract

“…A myoid phenotype was absent in all our cases; SMA and desmin were negative and only focal, isolated calponin‐positive cells were identified in two cases. However, myoid marker expression can be particularly strong in UTROCSTs with a predominant myoid phenotype; 11 their absence in RUTROCTs emphasizes the fact that UTROCSTs are a heterogeneous group of neoplasms with varying immunophenotype 3,5 …”

Endometrial metaplasias and reactive changes: a spectrum of altered differentiation

“…Small sex-cord-like structures with myoid differentiation,116 also known as plexiform tumourlets, are represented by sex-cord-like trabeculae that coexpress CD56, cytokeratins and myoid markers. They originate from the stroma of eutopic and ectopic endometria including adenomyosis.…”

Retiform uterine tumours resembling ovarian sex cord tumours

“…of sex‐cord stromal tumours of the ovary. Moreover, some of them exhibit, as we illustrated in another paper in the same issue, 4 a mixed sex cord and predominantly myoid phenotype. Thus, we agree with one of their papers, 2 which suggests that intratumoral myoid cells may be also part of the tumour proliferation in sex‐cord‐like structures of the usual type UTROSCTs.…”