Proceedings of the 2013 Joint JSTP/NTP Satellite Symposium

The first joint Japanese Society of Toxicologic Pathology (JSTP) and National ToxicologyProgram (NTP) Satellite Symposium, entitled “Pathology Potpourri,” was held on January29^th at Okura Frontier Hotel in Tsukuba, Ibaraki, Japan, in advance of theJSTP’s 29^th Annual Meeting. The goal of this Symposium was to present currentdiagnostic pathology or nomenclature issues to the toxicologic pathology community. Thisarticle presents summaries of the speakers’ presentations, including diagnostic ornomenclature issues that were presented, select images that were used for audience votingor discussion, and the voting results. Some lesions and topics covered during thesymposium include: treatment-related atypical hepatocellular foci of cellular alterationin B6C3F1 mice; purulent ventriculoencephalitis in a young BALB/c mouse; a subcutaneousmalignant schwannoma in a RccHan:WIST rat; spontaneous nasal septumhyalinosis/eosinophilic substance in B6C3F1 mice; a rare pancreatic ductal cell adenoma ina young Lewis rat; eosinophilic crystalline pneumonia in a transgenic mouse model; hyalineglomerulopathy in two female ddY mice; treatment-related intrahepatic erythrocytes inB6C3F1 mice; treatment-related subendothelial hepatocytes in B6C3F1 mice; spontaneousthyroid follicular cell vacuolar degeneration in a cynomolgus monkey; congenital hepaticfibrosis in a 1-year-old cat; a spontaneous adenocarcinoma of the middle ear in a youngCrl:CD(SD) rat; and finally a series of cases illustrating some differences betweencholangiofibrosis and cholangiocarcinoma in Sprague Dawley and F344 rats.