'Undermined Edges' is the characteristic feature of?

Appeared in: NIA - 29 January 2023

Explanation

A tubercular ulcer is classically defined by its undermined edges.
This specific morphology occurs because the tuberculous infection causes more significant destruction of the subcutaneous tissue and fat compared to the overlying skin.
This differential destruction leaves a flap of skin overhanging the ulcer crater, creating the characteristic 'undermined' appearance.

Option A: Diabetic (neuropathic) ulcers typically have a 'punched-out' appearance surrounded by a thick rim of callus. They are not characterized by undermined edges.
Option C: A rodent ulcer, which is a basal cell carcinoma, is known for its raised, rolled, and pearly or everted (turned out) edges. This is the opposite of an undermined edge.
Option D: Arterial ulcers, caused by ischemia, have sharply defined, 'punched-out' edges, giving them a cookie-cutter appearance. They do not have overhanging skin edges.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of ulcer types based on their morphological characteristics, specifically the appearance of the ulcer edge as background academic context rather than a clinical decision trigger.
Visual inspection of an ulcer's characteristics (edge, base, location, surrounding skin) is a fundamental nursing skill for differential diagnosis.
Identifying the likely cause of an ulcer is critical for initiating the correct management plan. For example, compression therapy for venous ulcers is contraindicated in severe arterial disease.
What if? If an ulcer on the leg has sloping edges and a base covered in healthy red granulation tissue, the most likely diagnosis would be a healing venous ulcer, not any of the options provided. This indicates that the wound is in the proliferative phase of healing.

How to Approach the Question

First, identify the key term in the question, which is 'Undermined Edges'.
This is a factual recall question. Access your knowledge about the classic descriptions of different types of ulcers.
Systematically evaluate each option against the key term.
Recall that a Diabetic ulcer is typically calloused and on pressure points.
Remember that a Rodent ulcer (basal cell carcinoma) has rolled, pearly edges.
Know that an Arterial ulcer has a 'punched-out' appearance due to ischemia.

Concept Tested & Keywords

Concept Tested: Identification of ulcer types based on their morphological characteristics, specifically the appearance of the ulcer edge.
Stem keywords: Undermined Edges, characteristic feature, ulcer
Lead-in keywords: is the

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E6 Medicine Harrison 22e Part 1 p. 449-451

E6 Medicine Davidson Principles Practice 24e pp. 1244-1246, 1243-1245

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.