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Chronic Granulomatous Disease: Differential Diagnoses & Workup
Updated: May 29, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
Other Problems to Be Considered
Bacterial diseases
Chronic mycoses
Tuberculosis
Histoplasmosis
Workup
Laboratory Studies
- The nitroblue tetrazolium (NBT) dye test
- Laboratory diagnosis of chronic granulomatous disease (CGD) can be made using the NBT test, stimulated with substances such as phorbol myristate acetate or Escherichia coli lipopolysaccharide, which promote an oxidative response in 90-100% of normal neutrophils.
- Neutrophils in patients with chronic granulomatous disease are unable to reduce oxidized NBT to insoluble blue formazan; this principle forms the basis of the standard diagnostic screening test for chronic granulomatous disease.
- This test is best used to identify gene carriers, and it has been used for the prenatal diagnosis of chronic granulomatous disease.
- Flow cytometric reduction of dihydrorhodamine: This test can also be used to diagnose chronic granulomatous disease. The principles are the same as for the NBT dye test, but a different dye is used. Additionally, X-linked carrier status can also be detected.
- Complete blood cell counts
- Peripheral blood leukocytosis (>8.5 X 103/µL) is a characteristic finding that reflects increased numbers of circulating neutrophils.
- Most patients are anemic (hemoglobin <12.5 g%), usually with a microcytic hypochromic picture.
- Microbiologic studies
- Culture and sensitivity studies may be helpful.
- Bacteria isolated from lesions in patients with chronic granulomatous disease are usually catalase positive.
- Quantitative immunoglobulin tests
- Levels of the 3 major classes of immunoglobulins, immunoglobulin G, immunoglobulin M, and immunoglobulin A, are increased.
- Immunoglobulin E levels are increased or in the reference range.
Imaging Studies
- X-ray and CT imaging
- Pulmonary disease is prominent, with recurrent pneumonia, empyema, and lung abscess formation.
- Discrete areas of persistent consolidation may be observed on radiographs and are often called encapsulating pneumonia. This sign is highly distinctive of chronic granulomatous disease.
- Less specific reticulonodular shadowing and hilar lymphadenopathy are also commonly observed.
Other Tests
- Other diagnostic tests include the following:
- Chemiluminescence testing to detect the degree of light generated by activated phagocytic cells
- Direct measurements of oxygen consumption
- Direct measurements of superoxide anion production
- Molecular diagnostics
- Polymerase chain reaction20
- Sequencing
- Allele-specific restriction enzyme analysis
Procedures
- Skin biopsy is important in correctly diagnosing chronic granulomatous disease.
Histologic Findings
Chronic granulomatous disease is histologically characterized by a mixed suppurative and granulomatous inflammation. A typical feature of visceral granulomas is the presence of golden-brown–pigmented histiocytes. Histochemical stains show that this material is composed of unsaturated fatty acids, phospholipids, and glycoproteins.
Periodic acid-Schiff (PAS) staining demonstrates the presence of carbohydrates, particularly polysaccharides such as mucoproteins. These substances stain reddish purple with the PAS reaction.
Electron microscopic findings suggest that the pigment represents lipofuscin bodies and appears to be derived from lysosomes. Granulomas consist of neutrophils and macrophages that contain yellow inclusions with areas of necrosis.
More on Chronic Granulomatous Disease |
| Overview: Chronic Granulomatous Disease |
Differential Diagnoses & Workup: Chronic Granulomatous Disease |
| Treatment & Medication: Chronic Granulomatous Disease |
| Follow-up: Chronic Granulomatous Disease |
| References |
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References
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Further Reading
Keywords
chronic granulomatous disease, CGD, fatal granulomatosis of childhood, immunodeficiency disorders, X-linked recessive disorder, gp91phox, p22phox, p67phox, Xp21.1, Rac2, impaired phagocytic function, defective cytochrome b function, oxidase absence, oxidase malfunction
Differential Diagnoses & Workup: Chronic Granulomatous Disease