## Distinguishing Intestinal-Type from Diffuse-Type Gastric Carcinoma ### Histopathological Comparison | Feature | Intestinal-Type | Diffuse-Type | |---------|-----------------|---------------| | **Growth pattern** | Cohesive, glandular structures | Scattered individual cells | | **Cell morphology** | Columnar cells, mucin-producing | Signet-ring cells (mucin-filled) | | **Mass formation** | Well-defined mass | Diffuse infiltration (linitis plastica) | | **Associated metaplasia** | Intestinal metaplasia present | Absent or minimal | | **Prognosis** | Better (earlier detection) | Worse (advanced at diagnosis) | | **Lauren classification** | Intestinal type | Diffuse type | ### Key Distinguishing Feature **Key Point:** The formation of **glandular structures with intestinal metaplasia** is the hallmark of intestinal-type gastric carcinoma. This arises from areas of chronic intestinal metaplasia (IM) in the gastric mucosa, following the Correa cascade: chronic gastritis → atrophy → intestinal metaplasia → dysplasia → carcinoma. **High-Yield:** Intestinal-type carcinoma shows: - Organized glandular/tubular architecture - Mucin-secreting cells arranged in recognizable structures - Often associated with H. pylori infection and intestinal metaplasia - Better survival rates (more localized, detected earlier) ### Diffuse-Type Characteristics **Clinical Pearl:** Diffuse-type carcinoma (signet-ring cell type) presents as: - Individual or small clusters of signet-ring cells infiltrating the gastric wall - No glandular formation - Linitis plastica (leather bottle stomach) appearance on imaging - Worse prognosis due to transmural infiltration and advanced stage at diagnosis **Mnemonic:** **INT-GUT** = **INT**estinal-type has **GUT** (glandular) structures; **DIF-FUS** = **DIF**fuse-type is **FUS**ed (scattered) cells. [cite:Robbins 10e Ch 17]
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