Lipid is best visualized on which technique in pathology?

INI-CET EXAM -2025

Pathology & Genetics

Medium

Appeared in: INI-CET EXAM -2025

Explanation

Frozen section is the optimal method because it involves rapidly freezing the tissue, which avoids the use of lipid-dissolving solvents like alcohol and xylene.
By preserving the lipids within the tissue, they can be subsequently stained with special fat-soluble dyes, such as Oil Red O or Sudan Black B, for microscopic examination.
This technique is the standard procedure for demonstrating fat accumulation in tissues, which is crucial for diagnosing various pathological conditions.

Option B: The process of creating paraffin-embedded sections involves multiple steps using organic solvents (alcohol for dehydration, xylene for clearing). These solvents dissolve and wash away all the lipids from the tissue, making it impossible to visualize them.
Option C: Immunohistochemistry (IHC) is a technique that uses antibodies to detect specific antigens, which are typically proteins. It does not directly stain or visualize lipids.
Option D: While electron microscopy (EM) can visualize lipid droplets at an ultrastructural level (as osmiophilic bodies), it is a highly specialized, time-consuming, and expensive technique. It is not considered the 'best' or primary method for routine diagnostic visualization of lipids in a pathology lab.

Visual 1: Image - A microscopic image of a liver tissue frozen section stained with Oil Red O. This would clearly show bright red globules of fat within the liver cells (hepatocytes), demonstrating steatosis.
Visual 2: Flowchart - A diagram comparing the workflow of 'Frozen Section' versus 'Paraffin-Embedded Section'. The flowchart would highlight that the dehydration and clearing steps (using alcohol and xylene) are bypassed in the frozen section method, visually explaining why lipids are preserved.

Clinical Relevance

Nursing practice connection: Knowing Histopathological techniques for lipid visualization helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The ability to visualize lipids is critical for diagnosing steatosis (fatty change) in organs, most notably in Non-Alcoholic Fatty Liver Disease (NAFLD) or Alcoholic Liver Disease.
This technique is also essential for identifying fat emboli in the lungs, which can be a fatal complication following long bone fractures or major orthopedic surgery.
It helps in the diagnosis of lipid storage diseases and certain tumors that may contain fat, like lipomas or liposarcomas.

How to Approach the Question

First, identify the key substance the question asks to visualize: 'Lipid'.
Next, consider the properties of lipids. They are fats and are soluble in organic solvents.
Review the options provided, which are different histopathological techniques. Think about the process involved in each technique.
Paraffin-embedding requires dehydrating the tissue with alcohol and clearing it with xylene. Since both are organic solvents, this process will wash away lipids. Therefore, this option is incorrect.
Frozen sectioning involves rapidly freezing the tissue. This process does not use chemical solvents, so it physically hardens the tissue while preserving its chemical components, including lipids. This makes it the most likely correct answer.
Evaluate the remaining options. Immunohistochemistry uses antibodies for proteins, not lipids. Electron microscopy is for ultrastructure and is not a routine method. This confirms that frozen section is the best choice.

Concept Tested & Keywords

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