Solid cell nests of the human thyroid in early stages of postnatal life. Systematic autopsy study.

The anatomical position and prevalence of solid cell nests (SCN) of the thyroid in early stages of postnatal life have not yet been clearly determined. In order to find out about these unsettled questions a systematic search of these ultimobranchial nests from 92 autopsied thyroids from neonates, children and young adults was undertaken. SCN were present in 61% of the patients; they were mainly located in the middle third of the lateral thyroid lobes, and placed along a central to paracentral and slightly dorsal longitudinal axis. These findings, as compared with our previous observations made in older adult thyroids, further demonstrate that there exist a constant anatomical position and prevalence of SCN in postnatal life. The significantly higher frequency of SCN in males (68%) than in females (48%) (p less than 0.01) found in a study that was further extended to 192 thyroids at early and late stages of postnatal life, is a question that requires further investigation.