The most common malignancy found in Marjolin’s ulcer is
**Question:** The most common malignancy found in Marjolin's ulcer is
A. Squamous cell carcinoma
B. Basal cell carcinoma
C. Squamous cell carcinoma with neuroendocrine differentiation
D. Adenocarcinoma
**Correct Answer:** A. Squamous cell carcinoma
**Core Concept:** Marjolin's ulcer is a rare, malignant neoplasm that develops in an existing chronic wound or scar, primarily affecting skin. It is believed to arise from a preexisting skin dysplasia or carcinoma in situ that has not been recognized or treated.
**Why the Correct Answer is Right:** Squamous cell carcinoma (SCC) is the most common malignancy found in Marjolin's ulcer. This type of cancer originates from keratinocytes, the cells that form the outermost layer of the skin (epidermis). In Marjolin's ulcer, the underlying dysplastic changes in the epidermis and dermis are already present prior to the development of the ulcer. As a result, the cancer will initially present as an ulcer with surrounding inflammation, often indistinguishable from other causes of chronic ulcers.
**Why Each Wrong Option is Incorrect:**
B. Basal cell carcinoma (BCC) is a less common variant of skin cancer. Although BCC is the most common type of skin cancer overall, it is less likely to arise in an existing wound or scar.
C. Squamous cell carcinoma with neuroendocrine differentiation (also known as small cell carcinoma) is a rare variant of SCC that exhibits neuroendocrine differentiation. However, it is much less common than the typical SCC and does not represent the most common malignancy in Marjolin's ulcer.
D. Adenocarcinoma refers to cancers originating from glandular or ductal epithelial cells. It is less likely to be the primary malignancy in Marjolin's ulcer compared to SCC, which arises from keratinocytes.
**Clinical Pearl:** Marjolin's ulcer is a reminder of the importance of recognizing and treating skin changes, particularly chronic ulcers, promptly and comprehensively. Failure to do so may lead to the development of malignant neoplasms, such as SCC, in these wounds.