Tag Archives: spleen

Imaging for Hematology
4
Feb

Overview

Imaging assesses marrow involvement splenic size and complications of hematologic disease. Modalities include MRI CT ultrasound and nuclear medicine. Imaging guides diagnosis staging and response assessment.

Marrow Imaging

MRI detects marrow infiltration edema and focal lesions in hematologic malignancies. Whole body MRI and PET CT assess disease burden and treatment response. Quantitative metrics support prognostication.

Splenic and Vascular Assessment

Ultrasound and CT evaluate splenomegaly portal hypertension and vascular complications. Imaging guides interventions and monitoring of therapy related effects. Correlation with laboratory data informs management.

Post Treatment Surveillance

Imaging monitors for relapse complications and treatment toxicity in hematologic patients. Choice of modality depends on disease type and clinical question. Multidisciplinary care integrates imaging into long term follow up.

Splenic System
4
Feb

Overview

The spleen filters blood removes senescent red cells and mounts immune responses to blood borne pathogens. It consists of red pulp for filtration and white pulp for lymphoid activity. Splenic size and function vary with hematologic and infectious conditions.

Splenic Architecture

Red pulp contains sinusoids and cords for erythrocyte processing and sequestration. White pulp contains periarteriolar lymphoid sheaths and follicles for immune activation. Vascular supply via the splenic artery supports high flow filtration.

Immune and Hematologic Roles

The spleen participates in antibody production and clearance of opsonized organisms. It stores platelets and can sequester blood cells in disease states. Splenic dysfunction predisposes to infection and hematologic complications.

Clinical Relevance

Splenomegaly trauma and infarction are common clinical issues requiring imaging evaluation. Ultrasound CT and MRI assess size lesions and vascular compromise. Splenectomy impacts immune function and requires vaccination and prophylaxis considerations.

Immune System
4
Feb

Overview

The immune system defends against pathogens and maintains tolerance to self through innate and adaptive mechanisms. Key components include lymphoid organs lymphocytes antigen presenting cells and soluble mediators. Balanced immune responses prevent infection and limit tissue damage.

Primary and Secondary Lymphoid Organs

Bone marrow and thymus generate lymphocytes while lymph nodes spleen and mucosal associated tissues coordinate immune responses. Lymphatic circulation transports antigens and immune cells for surveillance. Organ architecture supports antigen presentation and clonal expansion.

Cellular and Humoral Immunity

T cells mediate cellular immunity and B cells produce antibodies for humoral defense. Innate cells such as macrophages neutrophils and dendritic cells provide rapid nonspecific responses. Cytokines chemokines and complement orchestrate immune activity.

Clinical Relevance

Immune disorders include immunodeficiency autoimmunity and hypersensitivity reactions. Imaging identifies lymphadenopathy splenomegaly and organ involvement in systemic disease. Immunomodulatory therapies require monitoring for infection and malignancy risk.