a high index of suspicion is required to recognize the otologic manifestations of histiocytosis x for two reasons : the systemic manifestations of the disease are often so dramatic that the ear findings are overlooked , and the otologic findings of histiocytosis x can mimic more common diseases , including simple otitis externa , aural polyps , acute mastoiditis , chronic otitis media , and metastatic lesions .
C0442893
systemic
C0012634
diseases