Histopathology report

- adenocarcinoma: intestinal/diffuse/mixed/mucin-rich/mucin-poor.

- malignant lymphoma.

• tumour differentiation

- adenocarcinoma - well/moderate/poor defined as tubule-rich or tubule-poor.

- malignant lymphoma - MALToma/centrocytic/follicle centre cell/other.

- low-grade/high-grade.

- GIST - spindle cell/epithelioid.

- cellularity/atypia/mitoses/necrosis/margins/size.

- leiomyomatous/neural/stromal (CD34, CD117).

• tumour edge - pushing/infiltrative/lymphoid response.

• extent of local tumour spread (for carcinoma).

- pTis carcinoma in situ: intraepithelial tumour without invasion of the lamina propria.

- pT1 tumour invades lamina propria or submucosa.

- pT2 tumour invades muscularis propria (pT2a) or subserosa or lesser/greater omenta

- pT3 tumour penetrates serosa (visceral peritoneum) without invasion of adjacent structures.

- pT4 tumour invades adjacent structures (spleen, transverse colon, liver, diaphragm, pancreas, abdominal wall, adrenal gland, kidney, small intestine, retroperi-toneum).

- advanced carcinoma = pT2/pT3/pT4 ± lymph node involvement.

• lymphovascular invasion - present/not present.

• regional lymph nodes

- perigastric, hepatoduodenal, nodes along the left gastric, common hepatic, splenic and coeliac arteries. Also for the gastrooesophageal junction - paracardial, diaphragmatic, lower mediastinal paraoesophageal. Other intra-abdominal lymph nodes are distant metastases (pM1).

- pN0 no regional lymph node metastasis.

- pN1 1 to 6 involved regional node(s).

- pN2 7 to 15 involved regional nodes.

- pN3 more than 15 involved regional nodes.

• excision margins

- proximal and distal limits of tumour clearance (cm).

- separate proximal oesophageal/gastric and distal gastric/duodenal anastomotic doughnuts - involved/not involved/presence of mucosal dysplasia.

- deep circumferential omental margin of clearance (mm).

- deep margin of clearance (mm) in polypectomy and endoscopic mucosal resection specimens.

• other pathology

- satellite foci, polyps, intestinal metaplasia, dysplasia, gastric atrophy, Helicobacter gastritis, MALToma, hypertrophic gastropathy (e.g., Menetrier's disease, ZollingerEllison Syndrome), ECL cell hyperplasia/microcarcinoidosis.

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