Most sentitive investigation of pancreatic carcinoma is
**Core Concept**
Pancreatic carcinoma, a type of pancreatic cancer, is a complex disease with non-specific symptoms and a variable presentation. Early detection is crucial for improving prognosis, and various investigations are used to diagnose and stage the disease.
**Why the Correct Answer is Right**
The most sensitive investigation for pancreatic carcinoma is the Endoscopic Ultrasound (EUS). EUS combines high-frequency ultrasound with endoscopy to obtain detailed images of the pancreas and surrounding tissues. It allows for the detection of small tumors and assessment of lymph node involvement, making it a valuable tool for staging pancreatic cancer. The high resolution of EUS also enables accurate measurement of tumor size and detection of metastatic disease.
**Why Each Wrong Option is Incorrect**
**Option A:** Computed Tomography (CT) scan is less sensitive than EUS for detecting small pancreatic tumors, although it is useful for assessing the extent of disease and guiding biopsies.
**Option B:** Magnetic Resonance Imaging (MRI) is not typically used as a primary investigation for pancreatic carcinoma, as it has limited sensitivity compared to EUS and CT.
**Option C:** Serum tumor markers, such as CA 19-9, are not specific or sensitive enough for early detection of pancreatic cancer and are used primarily for monitoring disease progression.
**Clinical Pearl / High-Yield Fact**
EUS-guided fine-needle aspiration (FNA) is a valuable technique for obtaining tissue samples from pancreatic lesions, allowing for accurate histological diagnosis and guiding treatment decisions.
**Correct Answer: C. Endoscopic Ultrasound (EUS)**