Constitutional Trisomy 8 Mosaicism with Persistent Macrocytosis

Area of Science:

• Genetics
• Hematology
• Clinical Medicine

Background:

• Constitutional trisomy 8 mosaicism (CT8M) is a rare chromosomal abnormality with a wide spectrum of clinical presentations.
• The condition is associated with an increased risk of hematological malignancies, including leukemia and myelodysplastic syndrome.
• Due to its rarity and variable expressivity, CT8M can be challenging to diagnose, particularly in individuals with subtle phenotypes.

Observation:

• This report details the diagnostic journey of a 40-year-old female patient diagnosed with CT8M.
• The patient's case highlights the potential for delayed or missed diagnosis, especially when clinical features are not overtly severe.

Findings:

• The diagnostic process involved identifying the chromosomal abnormality, confirming mosaicism for chromosome 8.
• The case underscores the importance of considering rare chromosomal disorders in the differential diagnosis of unexplained medical conditions.
• Genetic testing and careful clinical evaluation are key to accurate CT8M diagnosis.

Implications:

• Accurate and timely diagnosis of CT8M is essential for appropriate patient management.
• Regular hematological monitoring is critical for the early detection of potential secondary malignancies in CT8M patients.
• Increased awareness among clinicians regarding CT8M can improve diagnostic rates and patient outcomes, especially in mild cases.