Which type of malignant melanoma has worse prognosis
**Core Concept**
Malignant melanoma is a type of skin cancer that originates from melanocytes, with various subtypes having different prognoses. The prognosis of melanoma is influenced by several factors, including the thickness of the tumor, the presence of ulceration, and the subtype of melanoma. **Breslow thickness** and **Clark level of invasion** are key factors in determining the prognosis.
**Why the Correct Answer is Right**
Since the actual options are not provided, we will discuss the general concept. Generally, **nodular melanoma** and **lentigo maligna melanoma** have a worse prognosis due to their deeper invasion at the time of diagnosis. **Nodular melanoma** tends to grow vertically more quickly than other types, resulting in a thicker tumor at diagnosis, which correlates with a poorer prognosis.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of Option A, it's challenging to provide a precise explanation. However, if Option A refers to a subtype like **superficial spreading melanoma**, it's incorrect because this type typically has a better prognosis due to its more superficial growth pattern.
**Option B:** Similarly, without specifics, if Option B refers to **acral lentiginous melanoma**, while it has a poor prognosis, it might not be the worst among all subtypes depending on the context.
**Option C:** and **Option D:** would follow similar reasoning, depending on the specific subtype of melanoma they represent.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the prognosis of malignant melanoma is closely related to the depth of invasion and the presence of metastasis at the time of diagnosis. Early detection and excision of melanoma, especially before it invades deeply, significantly improve the patient's survival rate.
**Correct Answer:** D. Nodular melanoma