Question of the Week, Sept 14

Welcome to your Question of the Week, Sept 14

Clinical Case Sept 14, 2020

A 60-year old male presenting with an elevated hemoglobin

He did not have any complaints other than weight loss in the last couple of months. His wife had noticed that he was often red in the face.
Phys/exam: central cyanosis
Lab: Hemoglobin 14 mmol/l, Hematocrit 66% 
A CT-scan was performed

What was the diagnosis?

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