Diagnostic investigation in carcinoma pancreas:-
**Core Concept**
Carcinoma of the pancreas is a complex and challenging diagnosis to make, often presenting with non-specific symptoms such as weight loss, jaundice, and abdominal pain. The diagnostic investigation for pancreatic cancer involves a combination of imaging studies, laboratory tests, and endoscopic procedures to establish the diagnosis and stage the disease.
**Why the Correct Answer is Right**
The initial investigation for pancreatic cancer typically starts with imaging studies, such as **Computed Tomography (CT)** scans, which provide detailed information about the tumor's location, size, and relationship to surrounding structures. CT scans can also help identify metastatic disease or involvement of major blood vessels. The CT scan is often followed by **Magnetic Resonance Imaging (MRI)** or **Endoscopic Ultrasound (EUS)** to further evaluate the tumor and assess its resectability.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because **ultrasound** is not a primary imaging modality for diagnosing pancreatic cancer, although it may be used as a screening tool in high-risk individuals.
* **Option B:** This option is incorrect because **mammography** is a diagnostic tool used for breast cancer and is not relevant to pancreatic cancer diagnosis.
* **Option C:** This option is incorrect because **bone scan** may be used to detect metastatic disease, but it is not a primary diagnostic tool for pancreatic cancer.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that pancreatic cancer often presents with non-specific symptoms, and a high index of suspicion is required to make an early diagnosis. A CT scan with contrast is the preferred imaging modality for evaluating pancreatic cancer.
**Correct Answer: C. Computed Tomography (CT) scans.**