MRCP2-2256

MRCP2-2256

A 35-year-old woman presented with a 3-month history of excessive night sweats and a weight loss of 8 kg. During the medical history, she denied any recent travel, diarrhea, or persistent cough.
Upon clinical examination, a 2.5 cm lymph node was found in the left supraclavicular fossa. No hepatosplenomegaly was observed.
The following investigations were conducted:
Haemoglobin (Hb) 118 g/l 135 – 175 g/l
White cell count (WCC) 4.8 × 109/l (90% neutrophils, 5% eosinophils) 4.0 – 11.0 × 109/l
Platelets (PLT) 170 × 109/l 150 – 400 × 109/l
Chest X-ray Mediastinal mass (6 cm)
Abdominal ultrasound Normal
What is the most probable diagnosis?