80 year old, asymptomatic man present with a Total Leucocyte Count of 1 lakh, with 80% lymphocytes and 20% PMC’s. What is the most probable diagnosis?
**Core Concept:** Total Leucocyte Count (TLC), Differential Leucocyte Count (DLC), and their significance in diagnostics.
**Why the Correct Answer is Right:** The correct answer is derived from analyzing the patient's TLC and DLC values. In this case, the patient has a Total Leucocyte Count of 1 lakh, which is considered high for an asymptomatic 80-year-old male. Additionally, there are 80% lymphocytes and 20% polymorphs (PMNs). This combination is indicative of an infection or inflammation, as lymphocytes are a response to cellular immunity, and polymorphs are related to acute inflammation.
**Why Each Wrong Option is Incorrect:**
A. **Infective Endocarditis (IE):** Though IE can cause elevated TLC and lymphocytosis, it typically presents with fever, heart murmur, and valvular abnormalities.
B. **Lymphoma:** While lymphocytosis is common in lymphomas, the patient is asymptomatic with no constitutional symptoms, making this less likely.
C. **Idiopathic Hyperleucocytosis (IH):** IH is a rare condition characterized by high TLC without an obvious cause. However, it is more common in young children or adults with malignancies, whereas this patient is 80 years old and has signs of infection or inflammation.
D. **Anaemia:** This option is incorrect as the focus is on the leucocyte count, not haemoglobin or platelet count.
**Clinical Pearl:** A high TLC with lymphocytosis and polymorphs can indicate infection or inflammation, prompting further investigation with a detailed history, physical examination, and investigations.
**Correct Answer:** B. **Infective Endocarditis (IE)**
**Explanation:** The patient's elevated TLC (1 lakh) and lymphocytosis (80%) are indicative of an infection or inflammation. Considering the patient's age, IE is a more plausible diagnosis than lymphoma, IH, or anaemia. While IE can present with constitutional symptoms, it might be asymptomatic or have mild symptoms, as seen in this case. The presence of PMNs (polymorphs) further supports the diagnosis of IE, as they are a part of the acute phase response in inflammation.
**Why This is a Clinical Pearls:** Understanding the significance of TLC, lymphocytes, and polymorphs in diagnosing infections or inflammation is crucial for diagnosing infections in older patients without fever, heart murmur, or valvular abnormalities. This is especially important in cases where the TLC is high but no obvious cause is detected.