A 62-year-old woman from Mumbai undergoes colonoscopy for iron-deficiency anaemia and is found to have a 4 cm mass in the caecum with biopsy-proven adenocarcinoma. Staging CT shows a single 2 cm lymph node in the hepatic hilum and no other metastases. The patient is fit for surgery. What is the most appropriate next step in management?

Question

Accepted Answer

A. Right hemicolectomy with D3 lymphadenectomy and hepatic hilum node assessment. ## Clinical Scenario Analysis

This patient has **colon cancer (caecal) with a single regional lymph node** in the hepatic hilum. The critical question is: **Is this a regional (N2) node or a distant metastasis (M1a)?**

## Lymph Node Classification in Colorectal Cancer

**Key Point:** Lymph nodes are classified as **regional (N-stage)** if they are along the arterial blood supply of the primary tumour. For a caecal cancer, regional nodes include those along the ileocolic, right colic, and superior mesenteric vessels — **including hepatic hilum nodes** if they are along the hepatic artery branches.

| Lymph Node Location | Caecal Cancer Classification | Significance |
|---|---|---|
| Ileocolic, right colic, SMA | Regional (N1/N2) | Part of D3 dissection |
| Hepatic hilum (along hepatic artery) | Regional (N2) | Part of D3 dissection |
| Coeliac, para-aortic | Distant (M1a) | Metastatic disease |
| Liver parenchyma | Distant (M1a) | Metastatic disease |

## Management Algorithm

```mermaid
flowchart TD
  A[Caecal cancer + hepatic hilum lymph node]:::outcome --> B{Node location along arterial supply?}:::decision
  B -->|Yes, regional N2| C[Right hemicolectomy with D3 dissection]:::action
  B -->|No, distant M1a| D[Palliative chemotherapy ± resection]:::action
  C --> E[Adjuvant chemotherapy if high-risk]:::action
  D --> F[Assess resectability of primary + mets]:::decision
```

**High-Yield:** A 2 cm lymph node in the hepatic hilum **adjacent to the hepatic artery** is considered **regional (N2) disease**, not distant metastasis. It should be included in the **D3 lymphadenectomy** (dissection of nodes along the arterial supply up to the origin of the feeding vessel).

**Clinical Pearl:** The distinction between N2 and M1a is anatomical: if the node lies along the vascular pedicle of the primary tumour's blood supply, it is regional. This patient is **fit for surgery** and has no other metastases — **curative intent surgery is appropriate**.

## Why Right Hemicolectomy with D3 Dissection?

1. **Caecal location** requires right hemicolectomy (removal of caecum, ascending colon, and proximal transverse colon).
2. **D3 lymphadenectomy** means dissection of nodes along the ileocolic, right colic, and superior mesenteric vessels — **including hepatic hilum nodes** if they are along the hepatic artery.
3. This is **curative intent surgery** with potential for long-term survival, even in N2 disease.
4. **Adjuvant chemotherapy** (FOLFOX or capecitabine + oxaliplatin) will follow based on final pathology.

**Mnemonic: D-STAGE LYMPH NODES — D3 = Dissection of nodes along the arterial supply**
- D0 = no nodes examined
- D1 = nodes within 5 cm of primary
- D2 = nodes along feeding vessels
- D3 = nodes up to origin of feeding vessel (includes hepatic hilum for right-sided cancers)

Answer

B. Hepatic resection of the lymph node followed by colectomy

Answer

C. Diagnostic laparoscopy to confirm metastatic disease before treatment

Answer

D. Palliative chemotherapy (5-FU/LV) without surgery

Explanation

Clinical Scenario Analysis

Lymph Node Classification in Colorectal Cancer

Management Algorithm

Why Right Hemicolectomy with D3 Dissection?

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Lymph Node Location	Caecal Cancer Classification	Significance
Ileocolic, right colic, SMA	Regional (N1/N2)	Part of D3 dissection
Hepatic hilum (along hepatic artery)	Regional (N2)	Part of D3 dissection
Coeliac, para-aortic	Distant (M1a)	Metastatic disease
Liver parenchyma	Distant (M1a)	Metastatic disease