A 35-year-old premenopausal patient as recently developed a 1.5 cm sized pigmented lesion on her back. Which of the following forms of tissue diagnosis will you recommend for her?
**Core Concept**
Shave biopsy or punch biopsy is generally not recommended for pigmented lesions, especially melanocytic lesions, due to the risk of causing damage to the surrounding tissue. Instead, a more definitive and less invasive method is preferred for diagnostic purposes.
**Why the Correct Answer is Right**
Excisional biopsy is the gold standard for diagnosing pigmented lesions, including melanomas. It involves surgically removing the entire lesion along with a margin of surrounding tissue. This approach allows for a definitive diagnosis and provides tissue for histopathological examination, including assessment of the lesion's depth, cellular atypia, and presence of ulceration. The removed tissue can also be examined for lymphovascular invasion, which is crucial for determining the stage of the melanoma.
**Why Each Wrong Option is Incorrect**
**Option A:** Shave biopsy is a superficial method that removes only the top layer of the skin, making it inadequate for assessing the depth and extent of pigmented lesions, especially melanomas.
**Option B:** Incisional biopsy involves removing a portion of the lesion, but it may not provide a complete picture of the lesion's architecture and can lead to sampling error.
**Option C:** Fine-needle aspiration cytology (FNAC) is a method that involves using a thin needle to aspirate cells from the lesion. While it can be useful for evaluating lymph nodes, it is not suitable for diagnosing pigmented lesions due to its limited ability to provide architectural information.
**Clinical Pearl / High-Yield Fact**
When evaluating pigmented lesions, it is essential to remember the ABCDE rule: Asymmetry, Border irregularity, Color variation, Diameter greater than 6 mm, and Evolving size or shape. This rule can help clinicians identify high-risk lesions that require further investigation.
**Correct Answer:** D. Excisional biopsy.