PMC6600760_01
Perforated Jejunal tumor with peritonitis.
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After peritoneal lavage with warm saline, we noticed a large 8x8 cm perforated tumor in the distal jejunum (Figure 1).
H& E stain (40X): Small round cells with perivesicular and pseudorosettes formation.
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Histopathological examination was suggestive of malignant round cell tumor (Figure 2), and Immunohistochemistry (IHC) was advised.
CD99: Diffuse membranous positive (40X).
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Tumor cells were positive for CD99(diffuse strong) (Figure 3), synaptophysin (focal) (Figure 4), and Ki 67(80%) (Figure 5) and negative for CD3,CD20,CD5,CD10,TdT (terminal deoxynucleotidyl transferase), panCK (pancytokeratin), chromogranin and CD56.
Ki 67 nuclear positive (40X).
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Tumor cells were positive for CD99(diffuse strong) (Figure 3), synaptophysin (focal) (Figure 4), and Ki 67(80%) (Figure 5) and negative for CD3,CD20,CD5,CD10,TdT (terminal deoxynucleotidyl transferase), panCK (pancytokeratin), chromogranin and CD56.
Synaptophysin cytoplasmic focal positive.
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Tumor cells were positive for CD99(diffuse strong) (Figure 3), synaptophysin (focal) (Figure 4), and Ki 67(80%) (Figure 5) and negative for CD3,CD20,CD5,CD10,TdT (terminal deoxynucleotidyl transferase), panCK (pancytokeratin), chromogranin and CD56.