Blocks for histology Figure

• sample the proximal and distal limits of resection - complete circumferential transverse sections (duodenum, oesophagus) or multiple circumferential blocks (mid-stomach).

• alternatively, if separate anastomotic doughnuts are submitted - one complete circumferential transverse section of each.

• count and sample all lymph nodes (lesser/greater omenta, splenic hilum) and process separately any named lymph nodes.

• sample a minimum of four blocks of tumour and wall to show any serosal involvement and the deepest point of omental invasion. Serial transverse slices (3-4 mm thick) or quadrant sections may be used according to the anatomy of the lesion and adjacent structures.

Figure 2.4. Distal gastrectomy - serial, transverse slices (a) or quadrant sections (b) may be used according to the anatomy of the lesion and adjacent structures. A longitudinal limit block (c) may be taken if the tumour is close (< 0.5 cm to it).

Figure 2.4. Distal gastrectomy - serial, transverse slices (a) or quadrant sections (b) may be used according to the anatomy of the lesion and adjacent structures. A longitudinal limit block (c) may be taken if the tumour is close (< 0.5 cm to it).

- tumour ulcer: four sections to include the ulcer base, edge, adjacent mucosa and wall.

- tumour polyp: two sections from the body of the polyp and a minimum of two from the underlying base and wall.

- linitis plastica: six transmural blocks as a gross lesion is often not evident and the extent of local spread may vary.

- GISTs: roughly one block per centimetre diameter to include mucosal, mural and extramural components of the tumour.

- omental tumour: representative blocks in relation to the nearest omental edge/serosa.

• sample any other satellite lesions or abnormal areas of mucosa.

• sample non-neoplastic gastric mucosa away from the tumour/ulcer (two blocks).

• serially slice, at 1 cm intervals, spleen and pancreas (if present) and sample two blocks.

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  • HOLMAN BROWNLOCK
    What are block in histology?
    7 years ago

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