Premium
A morphological study off a thyroid carcinoma in a medaka, Oryzias latipes (Temminck & Schlegel)
Author(s) -
Harada T,
Itoh H,
Hatanaka J,
Kamiya S,
Enomoto M
Publication year - 1996
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1046/j.1365-2761.1996.d01-83.x
Subject(s) - oryzias , thyroid , biology , pathology , follicular phase , epithelium , cytoplasm , endoplasmic reticulum , anatomy , endocrinology , microbiology and biotechnology , medicine , fishery , fish <actinopterygii>
A large mass protruding beyond the left operculum was found in an adult male medaka, Oryzias latipes (Temminck & Schlegel). Histologically, the mass was mainly composed of thyroid follicles measuring up to 292 μm in diameter. The follicular epithelium consisted of cuboidal or squamous cells. The follicles lacked colloidal material in the lumen. The thyroid tissue infiltrated into the kidney. Electron microscopically, the tumour cells were characterized by dilation and vesiculation of rough endoplasmic reticulum, which extended throughout the cytoplasm, and an irregular outline of the nucleus. Mitotic figures and partly degenerate cells were frequently observed. Based on the above features, the tumour was diagnosed as a follicular carcinoma of the thyroid, the first reported case in the medaka.