[Echographic patterns of orbital cholesteatomas and fibromyxomas].
UNLABELLED: Orbital cholesteatomas and fibromyxomas are relatively rare, but in echographic tissue differentiation both should be taken into consideration to avoid misdiagnosis. An orbital cholesteatoma may be mistaken for a hemangioma or a mixed tumor. Orbital cholesteatomas are distinguished by the following characteristics; high reflectivity, usually typical subperiostal location, wall or bone spikes, incompressibilty and immobility. Fibromyxomas are recognizable by their relatively regular structure, low to medium reflectivity and marked vascularity; they are poorly outlined, often showing signs of cellulitis. DIFFERENTIAL DIAGNOSIS: "periorbital malignancy" and the acoustic diagnostic group "sarcoma-lymphoma-pseudotumor".
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