[Morphofunctional characteristics of the thyroid of fetuses and newborns according to autopsy data from St. Petersburg]. / Morfofunktsional'naia kharakteristika shchitovidnoi zhelezy plodov i novorozhdennykh po sektsionnym materialam Sankt-Peterburga.

121 thyroids of fetuses after 25 weeks of gestation and newborns of mothers living in St-Petersburg were investigated. The conclusions on morpho-functional state of the thyroid at late terms of intrauterine development and newborns in St-Petersburg were made on the basis of macroscopical, histological, morphometrical and immunohistochemical findings.

[Immunophenotypic characterization of cutaneous neuroendocrine carcinoma derived from Merkel cells]. / Immunofenotipicheskaia kharakteristika neiroéndokrinnogo raka kozhi iz kletok Merkelia.

The following immunohistochemical markers were studied in 5 Merkel cell carcinomas: cytokeratins, epithelial membrane component, neuron-specific enolase, synaptophysin and chromogranin A. High expression of these markers in tumors allows one to consider them as having epithelial origin with neuroendocrine differentiation. Common leucocytic antigen proved to be very useful in differential diagnosis with malignant lymphoma.

[Peripheral neuroepithelioma]. / Perifericheskaia neiroépitelioma.

Neuroepithelioma of the soft tissues of the right parietotemporal region in the 25-year-old male patient is described. The tumor grew through the cranial bones into the dura mater. The patient died 1.5 months after the appearance of the first clinical signs of the disease of brain edema and invasion of the cerebellum into the great foramen occipitalis with compression of the medulla oblongata. The histological structure of the tumor and expression of neuron-specific enolase, synaptophysin, S-100 protein and glial fibrillary acidic protein by tumor cells prove its neurogenic origin.