Final answer:
Painless swelling of lymph nodes in the neck, armpits, and groin is seen as a clinical manifestation in patients with Lymphoma.
Step-by-step explanation:
Painless swelling of lymph nodes in the neck, armpits, and groin is seen as a clinical manifestation in patients with Lymphoma. Lymph nodes are part of the lymphatic system, which helps fight infections. In cases where the swelling does not improve after a few weeks and other symptoms are present, it may indicate the presence of lymphoma.