Figure 2From: An unusual unifocal presentation of Castleman’s disease in a young woman with a detailed description of sonographic findings to reduce diagnostic uncertainty: a case reportHistopathologic specimen shows a continuum of abnormal germinal centers (GC) with prominent CD 23-positive follicular dendritic cells (dense black brown staining) and subtle vascular proliferation (original magnification, ×200). MZ, mantle zone.Back to article page