Since the beginning of this century, it has well been known that there are some cases with blue- or dark blue-colored ear drum and another cases with black-colored mastoid, called “blue ear drum” or “idiopathic hemotympanum” and “black mastoid” or “mastoiditis nigra”. But even at present, it has remained still unsolved about their pathogenesis or etiology. In this paper, considering the present status and problems on the etiology of this disease bibliographically, the authors attempted to discuss the causative factors of them.
During past three years from 1965 to 1968, the authors treated 3 cases with blue ear drum and 2 cases with black mastoid. Three cases of blue ear drum were treated by simple mastoidectomy but all showed recurrency. In the black mastoid cases, it was observed that the main pathological change were limitted within the epitympanum, and the connection between the air spaces of mastoid cavity and mesotympanum were disrupted by them. These two cases healed completely after the removal of these pathological tissues.
In the literature, there have been many different hypothesis about the causative factor of blue ear drum, namely, anomaly of blood vessels, hematoma, hemangioma, inflammation, bloody inflammation, tubal obstruction and so on.The representative considerations are picked up as following three items;
1) inflammation (SIMPSON 1954 etc.
2) tubal obstruction (ARMSTRONGan d NASH 1962 etc.
3) inflammation and tubal obstruction (BODO 1963)
And the last one, compromissing of inflammation and tubal obstruction, seems most believable at present.
On the observations of the authors' cases and bibliographycal investigation, following conclusions were obtained:
1)“Blue ear drum” is defined as the condition in which the ear drum is colored dark blue or black blue, the cavity of the middle ear or mastoid are filled with black mucous fluid and the pathological tissues including black cholesterin granuloma.
2)“Black mastoid” is diagnosed for the condition in which the pathological changes appeared in “blue ear drum” are limitted just in the mastoid cavity (sometimes with extending to epitympanum), and it will be caused by dividing the whole middle ear spaces into two parts, meso-hypotympanum and mastoid, with epitympanal pathology.
3)“Cholesterin granuloma” has no etiological relationship with the discolorization of this disease.
4) For the occurrence of the “blue ear drum”, it was supposed that the tubal obstruction is necessary condition. However, once the condition of “blue ear drum” has completed, the air pressure in the cavity of middle ear will not be negative, and therefor, the passage of the tube does not influence to the condition of the middle ear cavity separated from the outside circumstance.
5) It is expecting to heal by simple mastoidectomy when the pathological changes are limitted in the mastoid cavity. But when the changes extend to the tympanic cavity, the radical operation of the whole middle ear would be necessary. In some cases, however, it is not able to decide whether this disease would recover by conservative treatment or not.
6) The etiological relatioship between “black mastoid” and middle ear cholesteatoma is not essential but it is supposed that the space separation at the epitympanum by cholesteatoma may cause the black mastoid.
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