case_images: PMC7845154_01
case_images: Positron emission tomography/computerised tomography demonstrating elevated tracer uptake in an 8.4-mm left level IV lymph node (red arrow).
case_images: f1000research-9-24902-g0000.jpg
case_images: PMC7845154_01_f1000research-9-24902-g0000.jpg
case_images: f1
case_images: Histology from left neck dissection showing metastasis of poorly differentiated carcinoma in lymph node (40X magnification).. (
  a) Atypical cells with pleomorphic nuclei demonstrated Hematoxylin and Eosin stain. (
  b) Immunohistochemistry for CK20 with characteristic cytoplasmic and nuclear staining. (
  c) Immunohistochemistry for CDX-2. (
  d) Intracellular mucus detected on special stain (ABPAS) confirming glandular (adenocarcinoma). ABPAS is an Alcian Blue stain which demonstrates intra and extracellular mucous.
case_images: f1000research-9-24902-g0001.jpg
case_images: PMC7845154_01_f1000research-9-24902-g0001.jpg
case_images: f2
case_images: Immunohistochemical analysis confirmed an intestinal origin ( Figure 2).