Cavernous haemangioma arises from?

Appeared in: NIA - 29 January 2023

Explanation

Cavernous hemangiomas are benign vascular tumors characterized by large, dilated, blood-filled spaces or 'caverns'.
These large-volume, low-pressure channels are structurally analogous to veins, distinguishing them from other vascular anomalies.
Unlike capillary hemangiomas, they are often more infiltrative, involve deeper structures, and typically do not regress spontaneously.

Option B: Arteries are high-pressure vessels. Anomalies involving arteries, like Arteriovenous Malformations (AVMs), are high-flow lesions, which is inconsistent with the low-flow nature of cavernous hemangiomas.
Option C: Capillaries are microscopic vessels that form capillary hemangiomas (e.g., 'strawberry hemangiomas'), which are composed of small, tightly packed vascular channels, not large caverns.
Option D: Lymph vessels carry lymph, not blood. Tumors arising from these vessels are called lymphangiomas (e.g., cystic hygroma) and are filled with lymphatic fluid.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathophysiology and classification of vascular anomalies, specifically cavernous hemangiomas as background academic context rather than a clinical decision trigger.
Nurses must be aware of the bleeding risk associated with cavernous hemangiomas, especially those in the brain or liver, where rupture can be a medical emergency.
Patient education is crucial, particularly regarding the avoidance of trauma to the affected area and recognizing signs of complications like sudden pain or swelling.
What if? If a patient with a known liver cavernous hemangioma presents with sudden, severe abdominal pain and signs of shock (hypotension, tachycardia), the nurse should immediately suspect hemorrhage and initiate emergency protocols for internal bleeding.

How to Approach the Question

This is a factual recall question testing knowledge of pathology.
Identify the key term in the question: 'Cavernous haemangioma'.
Focus on the descriptive word 'cavernous', which implies large, cave-like structures.
Mentally review the types of blood vessels: arteries (thick, muscular, high-pressure), veins (thin-walled, large-lumen, low-pressure), and capillaries (microscopic).
Associate the 'large, cavernous' structure with the characteristics of a vein.
Eliminate other options by recalling that capillaries form capillary hemangiomas and lymph vessels form lymphangiomas.

Concept Tested & Keywords

Concept Tested: Pathophysiology and classification of vascular anomalies, specifically cavernous hemangiomas.
Stem keywords: Cavernous haemangioma, arises from
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 524-526

E6 Medicine Harrison 22e Part 2 p. 1361-1363

Practise the full NIA - 29 January 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.