In which brain tumor is there a presence of multiple deposits, well defined and usually located at the grey a… - RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Medical & Surgical Nursing

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Appeared in: RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Explanation

Metastatic brain tumors are the most common cause of multiple intracranial lesions in adults.
They spread from a primary cancer elsewhere in the body through the bloodstream (hematogenous spread).
Tumor cells get trapped in the small arteries at the junction of grey and white matter, leading to multiple, well-demarcated lesions in this specific location.
The most common primary cancers that metastasize to the brain are lung, breast, melanoma (skin), kidney, and gastrointestinal tract cancers.

Option A: Ependymomas are primary tumors that arise from the ependymal lining of the ventricles, not from metastatic spread. They are typically single masses located within the ventricular system (e.g., 4th ventricle) or spinal cord.
Option C: Medulloblastoma is a primary tumor located almost exclusively in the cerebellum (posterior fossa), especially in children. It does not present as multiple deposits at the grey-white junction of the cerebral hemispheres.
Option D: Oligodendrogliomas are primary, typically solitary, slow-growing tumors found in the white matter of the cerebral hemispheres, often with calcification. They do not fit the description of multiple deposits.

Visual 1: MRI Brain with Contrast - An axial T1-weighted MRI showing multiple, distinct, ring-enhancing lesions at the junction of the grey and white matter, which is a hallmark of metastatic disease.
Visual 2: Diagram - A schematic illustrating how tumor emboli from a distant primary cancer travel through the bloodstream and become lodged in the smaller vessels at the corticomedullary (grey-white) junction, leading to the formation of multiple secondary tumors.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Differential diagnosis of brain tumors based on location and morphology as background academic context rather than a clinical decision trigger.
In clinical practice, the discovery of multiple, well-defined brain lesions at the grey-white junction immediately raises suspicion of metastatic disease.
This finding necessitates a thorough systemic workup to identify the primary cancer, which is crucial for determining the overall treatment plan and prognosis.
Nursing care for a patient with suspected brain metastases involves neurological assessments, managing symptoms like seizures or increased intracranial pressure, and providing psychosocial support while they undergo diagnostic testing for the primary cancer.

How to Approach the Question

First, break down the question to identify the key diagnostic clues: 1) 'multiple deposits', 2) 'well defined', and 3) 'located at the grey and white matter junction'.
Consider the pathophysiology implied by 'multiple deposits'. This pattern suggests a process that spreads throughout the brain, which is most commonly due to spread from a distant site (metastasis) rather than a single point of origin (primary tumor).
Relate the location 'grey and white matter junction' to blood flow. This is a classic location for hematogenous (blood-borne) spread, as tumor emboli get trapped where vessels narrow.
Evaluate the options based on this pattern. Metastatic tumors are the classic example of this presentation.
Eliminate the other options by recalling their typical locations: Ependymoma (ventricles), Medulloblastoma (cerebellum), and Oligodendroglioma (often a single mass in cerebral white matter).

Concept Tested & Keywords

Concept Tested: Differential diagnosis of brain tumors based on location and morphology.
Stem keywords: brain tumor, multiple deposits, well defined, grey and white matter junction
Lead-in keywords: In which
Negative lead-in flag: false

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