Gum hyperophy is seen in which type of AML?
**Core Concept**
Gum hypertrophy, also known as gingival hypertrophy, is a clinical manifestation associated with acute myeloid leukemia (AML) that is characterized by the enlargement of the gums. This condition is often seen in patients with specific subtypes of AML, particularly those with monocytic differentiation.
**Why the Correct Answer is Right**
The correct answer is associated with AML-M5, also known as acute monocytic leukemia. In this subtype, the monocytic cells infiltrate various organs, including the gums, leading to their hypertrophy. The monocytic cells release granules that contain proteolytic enzymes, which contribute to the breakdown of the extracellular matrix and subsequent tissue enlargement. The gingival hypertrophy in AML-M5 is a result of the accumulation of these monocytic cells and the release of their granules.
**Why Each Wrong Option is Incorrect**
**Option A:** AML-M2, also known as acute myeloblastic leukemia with maturation, is characterized by the accumulation of cells with myeloblastic and myeloid maturation features. This subtype does not typically present with gum hypertrophy.
**Option B:** AML-M3, also known as acute promyelocytic leukemia, is characterized by the accumulation of cells with promyelocytic features. This subtype is associated with coagulopathy and bleeding rather than gum hypertrophy.
**Option C:** AML-M4, also known as acute myelomonocytic leukemia, is characterized by the accumulation of cells with both myeloid and monocytic features. While this subtype can present with gum hypertrophy, it is less common than in AML-M5.
**Clinical Pearl / High-Yield Fact**
It is essential to note that gum hypertrophy can be a subtle manifestation of AML-M5, and a thorough dental examination should be performed in patients suspected of having this subtype of leukemia. A history of recent dental procedures or poor dental hygiene can mask the symptoms, making it crucial to maintain a high index of suspicion.
**Correct Answer:** C. AML-M4