**Question:** 4 years old child having palpable abdominal mass & hypertension with sweating & diarrhea is due to –

A. Acute leukemia
B. Neuroblastoma
C. Wilms' tumor
D. Rhabdomyosarcoma

**Core Concept:** Abdominal tumors in pediatric patients can present with various symptoms, including abdominal mass, hypertension, and systemic symptoms like sweating and diarrhea. These symptoms are nonspecific but can point towards certain types of tumors.

**Why the Correct Answer is Right:**

The correct answer, **C. Wilms' tumor**, is a malignant neoplasm primarily affecting the kidneys in children, particularly those under 5 years of age. It is the most common kidney tumor in childhood and accounts for 90% of renal malignancies in children. Wilms' tumor often presents with abdominal mass, hypertension, and systemic symptoms like sweating and diarrhea due to its systemic effects on catecholamines release and renal function.

**Why Each Wrong Option is Incorrect:**

A. **Acute leukemia** is a group of cancers involving uncontrolled growth of blood cells in the bone marrow. It is typically characterized by symptoms like fever, fatigue, and infections, not abdominal mass, hypertension, and systemic symptoms.

B. **Neuroblastoma** is a malignant tumor arising from neural crest cells. While abdominal mass and hypertension are present, neuroblastoma typically lacks systemic symptoms like sweating and diarrhea.

D. **Rhabdomyosarcoma** is a pediatric soft tissue sarcoma that can involve the abdomen. However, the presentation with hypertension, abdominal mass, and systemic symptoms is more consistent with Wilms' tumor.

**Clinical Pearl:**

Clinicians should consider Wilms' tumor in the differential diagnosis of pediatric patients presenting with abdominal mass, hypertension, and systemic symptoms like sweating and diarrhea, especially when the symptoms are not consistent with other common pediatric malignancies. A prompt diagnosis and referral to a pediatric oncologist are crucial for timely treatment and better prognosis.