====== Fischgold’s digastric line ======

{{::fischgold_s_digastric_line.png?500|}}

FDGL=[[Fischgold’s digastric line]], FBML= [[Fischgold’s bimastoid line]], x+y=total overhang of [[C1]] on [[C2]].

see [[Rule of Spence]].

joins the digastric notches.The normal distance from this line to the middle of the atlanto-occipital joint is 10 mm (decreased in BI)
((Hinck VC, Hopkins CE, Savara BS. Diagnostic Criteria of Basilar Impression. Radiology. 1961; 76)).

No part of odontoid should be above this line.

More accurate than the bimastoid line (FBML).