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Low-grade cribriform cystadenocarcinoma (LGCCC) is a rare tumor, defined in the 2005 WHO classification as a primary salivary duct tumor. Previously, the neoplasm had been recognized as a variant of salivary duct carcinomas. A 56-year-old Japanese woman noticed a mass in the left subaural region. On radiological examinations, a multicystic tumor was seen in the left parotid gland. Fine-needle aspiration biopsy was performed. The smears revealed several characteristic cytologic features. The tumor cells were arranged in irregular overlapping and showed inconspicuous nuclear atypia with variable-sized and irregularly shaped cytoplasmic vacuoles. Based on these findings, a cystic tumor with uncertain malignancy was diagnosed. A parotidectomy was performed, because the tumor was slowly growing and contained solid components on the radiological images. Based on the histologic findings, along with immunohistochemistry, LGCCC was diagnosed based on resemblance to breast low-grade ductal carcinoma in situ and intraductal proliferation of tumor cells. This is the first report of the cytomorphological findings of LGCCC.

Effects of retained austenite on press formability were investigated, using austempered 0.4C-Si-1 .2Mn sheet steels with high tensile strength of more than 980 MPa.The

Polymerization of 1,3-dioxolane was examined with organo-aluminum compounds, acetyl chloride-metal halides, and acetic anhydride-perchloric acid as initiators. Poly-1,3dioxolane obtained easily with these initiators was a white crystalline solid with a melting point of 50-55 "C. 1,3-Dioxolanes with a substituent at C,-atom could not be polymerized with the initiators described ahwe, while those having a substituent at C,-atom only polymerized to viscous materials, even though the rate of polymerization was slower than that of unsubstituted 1,3-dioxolane. -4 discussion about the position of bond scission of the 1,3dioxolane ring in cationic polymerization is presented. ZUSAMMENFASSUNG:Die Polymerisation von 1,3-Dioxolan mit Al-organischen Verbindungen, Acetylchlorid-Metallhalogeniden und Essigsaureanhydrid-Perchlorsaure als Initiatoren wird beschrieben. Das mit diesen Katalysatoren leicht herstellbare Poly-1,3-dioxolan war eine weioe, kristalline Masse rnit einem Schmelzpunkt von 50-55 "C. 1,3-Dioxolane mit einem Substituenten am C,-Atom konnten nicht mit den oben angegebenen Katalysatoren polymerisiert werden, wahrend solche mit Substituenten in 4-Stellung zu viskosen Materialien polymerisieren, allerdings mit kleinerer Polymerisationsgeschwindigkeit als unsubstituiertes 1,3-Dioxolan. Eine Diskussion iiber den Ort der Ringspaltung des 1,3-Dioxolans bei der kationischen Polymerisation wird gegeben.