Sarcina ventriculi in an Endoscopic Ultrasound-Guided Fine Needle Aspiration of a Perigastric Lymph Node with Metastatic Pancreatic Adenocarcinoma: A Carry-Through Contaminant Bacterial Microorganism from the Stomach

Figure 3

(a) In focal areas of the direct smears, numerous collections of large bacteria arranged in tetrads (Sarcina ventriculi) were noted. In addition, scattered smaller cocci and a few bacilli (mixed bacteria) were also identified in backgrounds with necrosis and poorly preserved nucleated cells (Papanicolaou stain, original magnification 1000X). (b) Highest power magnification depicting clustered Sarcina organisms with adjacent macrophages, noting comparatively clear background without accompanying acute inflammation, suggesting carry-through microorganisms from lumen of GI tract (Papanicolaou stain, original magnification 1000X).

(a)

(b)