Achalasia secondary to cancer versus primary achalasia

What findings help distinguish achalasia secondary to cancer from primary achalasia? 

Features suggestive for secondary achalasia (cancer):

• LES “beak” is irregular, eccentric, or abruptly marginated.

• LES “beak” is long, 3.5 cm or longer.

• Esophageal body is relatively narrow, caliber 4 cm or smaller.

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