A bluish color over the drum membrane is occasionally observed. The usual cause of such discoloration is the development of a hemorrhagic blister occurring in certain types of acute otitis media. This condition is readily recognized, as other evidences of an acute infection of the middle ear are present. In rare instances this bluish tinge is transmitted from the inner wall of the tympanum and is due to the high position of the dome of the jugular bulb, where an extensive dehiscence in the bony covering exists. In cases of this sort, the bluish color is restricted to the lower segment of the drum membrane and, for this reason, can readily be differentiated from the blue membrana tympani described subsequently.
Occasionally it happens that the drum membrane presents a blackish-blue color extending over the entire pars tensa. I have never seen this bluish discoloration extending to
SHAMBAUGH GE. THE BLUE DRUM MEMBRANE. Arch Otolaryngol. 1929;10(3):237–240. doi:10.1001/archotol.1929.00620060032002
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