Definition

Noun: A medical and biological term describing the condition or state of having an abnormally low number of cells in a tissue, organ, or bodily fluid compared to the normal, expected count.

Usage

This term is primarily used in medical, pathological, and laboratory contexts to describe diagnostic findings. It is the opposite of "hypercellularity." * The bone marrow biopsy revealed significant hypocellularity, explaining the patient's low blood counts. * Hypocellularity in the synovial fluid sample suggested a non-inflammatory arthritis.

Examples

• The pathologist's report noted hypocellularity in the examined lymph node tissue.
• A common cause of bone marrow hypocellularity is aplastic anemia.
• The hypocellularity observed under the microscope was consistent with the diagnosis of atrophy.

Advanced Usage

• The term is often quantified or qualified in detailed reports (e.g., "mild hypocellularity," "marked hypocellularity," "hypocellularity involving 30% of the sample").
• It can be used in a comparative sense: "The hypocellularity of the patient's bone marrow was striking when compared to the normal control."

Variants and Related Words

• Hypocellular (adjective): Describing a tissue or sample with few cells.
  • The specimen was hypocellular and inadequate for diagnosis.
• Cellularity (noun): The state of having cells; the number and type of cells present.
• Hypercellularity (noun): The state of having abnormally many cells.
• Pancytopenia (noun): A medical condition often associated with bone marrow hypocellularity, characterized by low counts of all types of blood cells.

Synonyms

• Acellularity (though this can imply a complete absence of cells)
• Low cellularity
• Cell depletion

Antonyms

• Hypercellularity
• Cellularity (in a normal context)

Noun

1. the state of having abnormally few cells