The McCallum co-axial dilators for sialangiography and dacrocystography.
D000328:Adult; D004106:Dilatation; D005260:Female; D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging*; D010306:Parotid Gland / Q000000981:diagnostic imaging; D012796:Sialography / Q000295:instrumentation* / Q000379:methods; D013679:Technology, Radiologic / Q000295:instrumentation