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Qualitative evaluation of the effusion. The presence of echogenic material and/or septa within the effusion are suggestive of an exudate. In image (A), some echogenic and corpuscular materials are evident in the deep portion of the effusion (non-septated complex); in images (B,C), the septa are clearly evident (complex septated effusions); in image (D), the effusion appears homogeneously echogenic (the case of pleural empyema in the early phase).
