The doctor examined the oesophaguses of the patients.

He was diagnosed with oesophagal cancer.

He was diagnosed with a rare form of oesophagical cancer.

He was diagnosed with oesophagean cancer.

The patient was diagnosed with oesophagic cancer.

Oesophagoscopy is a medical procedure used to examine the esophagus.

The doctor used an oesophagoscope to examine the patient's throat.

The hospital has a collection of oesophagoscopes for diagnosing esophageal conditions.

The doctor performed multiple oesophagoscopies to diagnose the patient's condition.

The Oesterlé-Masser conjecture is a famous unsolved problem in number theory.