A 70year old man complains of progressive dysphagia for 8 weeks. Upper

A 70year old man complains of progressive dysphagia for 8 weeks. Upper GI Endoscopy revealed malignant looking lesion at 30cm. What is the most appropriate investigation to assess local invasion a) Barium swallow b) CXR c) Endoscopic USS d) MRI e) PET scan

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The answer is clear. Here is a comprehensive explanation:

Answer: c) Endoscopic USS (Endoscopic Ultrasound — EUS)

Clinical Context

A 70-year-old man with 8 weeks of progressive dysphagia and a malignant-looking lesion at 30 cm on endoscopy represents a mid-oesophageal tumour (likely squamous cell carcinoma at that level). Once a lesion is identified endoscopically and biopsied, the next priority is staging — particularly assessing local (T-stage) invasion before deciding on resectability and treatment.

Why EUS is the Best Answer

EUS is superior to all other modalities for T-staging (local invasion) of oesophageal cancer.

EUS uses a high-frequency ultrasound probe in close proximity to the tumour, allowing delineation of all five layers of the oesophageal wall:
1. Mucosa
2. Muscularis mucosa
3. Submucosa
4. Muscularis propria
5. Adventitia
This allows accurate determination of depth of invasion (T1a → T4b), which no other listed modality can achieve.
EUS also has higher sensitivity than CT or PET-CT for regional nodal staging.
EUS-FNA can simultaneously sample suspicious lymph nodes for cytology.

"EUS is superior to CT and PET-CT for T staging. The sensitivity and specificity for identifying the various T stages of oesophageal cancer is high." — Grainger & Allison's Diagnostic Radiology

Why the Other Options Are Inferior for Local Invasion

Option	Role in Oesophageal Cancer	Limitation for Local Invasion
a) Barium swallow	Detects luminal irregularity, stricture morphology	Cannot assess depth of wall invasion or nodal involvement
b) CXR	May show mediastinal widening or aspiration	No staging value for local invasion
c) EUS ✅	Best for T-staging (local invasion)	—
d) MRI	Limited role — motion artefacts from cardiac/respiratory motion degrade image quality	Not used for routine oesophageal staging in clinical practice
e) PET scan	Standard of care for detecting distant/unsuspected metastases	Poor spatial resolution; cannot distinguish T stages; not designed for local invasion assessment

"MRI is not used for imaging the oesophagus. Image quality is hampered by motion artefacts from cardiac motion, breathing and peristalsis."

"CT is rather limited in the local staging of oesophageal tumours because it is unable to delineate the layers of the oesophageal wall."

"The most important reason that PET-CT is used in oesophageal cancer staging is the high proportion of patients who have unsuspected metastatic disease at presentation."

— All from Grainger & Allison's Diagnostic Radiology

Staging Pathway Summary

Endoscopy + Biopsy (diagnosis confirmed)
        ↓
CT Chest/Abdomen/Pelvis (initial staging, rule out obvious T4/M1)
        ↓
EUS ← BEST for local invasion (T stage) and locoregional nodes (N stage)
        ↓
PET-CT (detect occult metastases before curative-intent treatment)

The answer is c) Endoscopic USS.

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