MRCP2-3643
A 27-year-old man was referred to clinic by his general practitioner due to increasing exertional dyspnoea over the past two months. He used to be physically active and jogged regularly, but now he gets breathless climbing just one flight of stairs. He has a past history of asthma and underwent an orchidopexy as a child for an undescended right testis. On examination, gynaecomastia was noted and a firm mass of 1 cm × 1 cm was found in his right testis.
The following investigations were conducted and showed abnormal results:
– Serum alpha-fetoprotein 90 kU/L (<10)
– Serum beta-human chorionic gonadotrophin 1250 U/L (<5)
What is the most likely diagnosis?