Dacryocytes

Dacryocytes, also known as tear-drop cells, are red blood cells that adopt a teardrop shape on peripheral blood smears. They typically have a pointed projection at one end with a rounded opposite end and can vary in size.

The formation of dacryocytes is closely linked to abnormal marrow environments. They arise when erythrocytes are forced to pass through fibrotic or crowded bone marrow or through altered splenic microcirculation, causing the cells to deform into a teardrop shape. This mechanical distortion reflects underlying marrow stress or infiltration rather than a primary red cell defect.

Dacryocytosis is most strongly associated with myelofibrosis (primary or secondary) and other conditions that cause bone marrow fibrosis or extensive marrow involvement. They can also be seen in a range of anemias and hematologic disorders, including severe iron deficiency, megaloblastic anemia, and certain myelodysplastic syndromes. The finding is not disease-specific, but it supports investigation for an underlying marrow process or extramedullary hematopoiesis.

Diagnosis relies on examination of a peripheral blood smear where dacryocytes are identified by their distinctive shape. Assessment often includes complete blood counts, reticulocyte measurements, and bone marrow evaluation (biopsy or aspiration) to determine the presence and extent of marrow fibrosis or infiltration.

Management focuses on treating the underlying condition. Supportive care for anemia, such as transfusions, may be employed as needed, while specific therapies target the root marrow disorder rather than the dacryocytes themselves.