**Question:** Pseudolymphoma can result from long-term use of which medication(s)?

**Core Concept:** Pseudolymphoma is a condition characterized by the proliferation of lymphocytes in response to various stimuli, leading to a histological appearance similar to true lymphoma. It can be caused by various factors, including medications.

**Correct Answer: C.**

**Why the Correct Answer is Right:** Pseudolymphoma is a reactive lymphoid hyperplasia, not a true lymphoma. It occurs when the normal physiological processes of lymphocyte proliferation, differentiation, and apoptosis are disrupted. Long-term use of immunosuppressive medications can lead to this disruption, causing the proliferation of lymphocytes and the histological appearance of a lymphoma.

**Why Each Wrong Option is Incorrect:**

A. **Option A (Thalidomide):** Although thalidomide can cause lymphoproliferative disorders, it primarily causes lymphangiectasia, not pseudolymphoma.

B. **Option B (Corticosteroids):** Long-term corticosteroid use can cause lymphoproliferative disorders, but pseudolymphoma is not a common complication.

C. **Option C (Immunosuppressive agents):** Immunosuppressive agents, including cyclosporine, tacrolimus, and azathioprine, can cause lymphoproliferative disorders such as pseudolymphoma when used long-term.

D. **Option D (Antineoplastic agents):** Antineoplastic agents can cause lymphoproliferative disorders, but pseudolymphoma is not a common complication.

**Clinical Pearl:** Pseudolymphoma should be considered in patients presenting with lymphadenopathy, particularly if the history includes long-term immunosuppressive therapy or exposure to antineoplastic agents. This knowledge is crucial for accurate diagnosis and appropriate management of the condition.