Figure 2

Histological and immunohistochemical stains of Meckel’s diverticulum. (a) Moderately differentiated neuroendocrine tumour (haematoxylin and eosin stain; original magnification, ×400). Tumour cells show cytoplasmic staining for synaptophysin (b) (original magnification, ×400), cytokeratin AE1/AE3 (c) (original magnification, ×400) and chromogranin A (d) (original magnification, ×400). (e) Antigen Ki-67 immunostaging was positive in 3% of tumour cells. (original magnification, ×400).