eMedicine Specialties > Dermatology > Diseases of Pigmentation
Griscelli Syndrome: Differential Diagnoses & Workup
Updated: Feb 1, 2008
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
Chediak-Higashi Syndrome
Elejalde Syndrome
Other Problems to Be Considered
HLH syndrome
Familial lymphohistiocytosis (MIM 603553)
X-linked lymphoproliferative syndrome (MIM 308240)
Partial albinism and immunodeficiency syndrome (MIM 604228)
Elejalde syndrome (MIM 256710)
Workup
Laboratory Studies
- Characteristic laboratory features include pancytopenia, hypofibrinogenemia, hypertriglyceridemia, and hypoproteinemia.
- In GS without delayed-type cutaneous hypersensitivity and impaired natural killer cell function manifests as the ever-present immunologic abnormalities.
- Some patients with GS have secondary hypogammaglobulinemia, impaired major histocompatibility complex–mediated cytotoxic effects, a decreased capacity of lymphocytes to trigger a mixed lymphocyte reaction, or various functional granulocytic abnormalities. One report noted low levels of immunoglobulin G2 in a patient with GS.
- Evidence of hepatitis can be demonstrated by abnormal liver function results. Neonatal hyperbilirubinemia (peak total bilirubin 26.5 mg/dL at age 4 wk) has been reported.
- Chromosome analysis can be performed to detect mutations in MYO5A and RAB27A.
Imaging Studies
- Both CT and MRI are used to assess GS. Usually, findings are normal at birth. When the disease manifests, imaging findings are abnormal. Findings in the 2 variants (ie, MYO5A, RAB27A) of GS are different.
- Isolated congenital cerebellar atrophy was observed in a patient with the MYO5A defect. No evidence of infiltration of lymphocytes is present in these patients.
- In GS caused by RAB27A defects, CT scan can show areas of coarse calcification in the globi pallidi, left parietal white matter, and periventricular and left brachium pontis.
- Patients with GS can manifest hypodense signals in the genu and posterior limb of the internal capsule on the right side (which is compatible with inflammatory changes), as well as posterior aspects of both thalami, together with minimal generalized atrophy. CT scanning can also suggest cell infiltration of the brain.
- In both variants, MRI can reveal areas of increased T2 signal intensity and a focal area of abnormal enhancement in the subcortical white matter.
- At birth, findings from long-bone plain radiography have been reported to be normal.
- When GS manifests, abdominal ultrasonograms can show hepatosplenomegaly with intrahepatic cholestasis and absence of bile duct distension.
Other Tests
- Transmission electron microscopy of the skin shows an accumulation of numerous normal-sized stage IV mature melanosomes in the cytoplasm of melanocytes, with virtual absence of such melanosomes in adjacent keratinocytes. These findings allow GS to be distinguished from Chediak-Higashi syndrome.
- The peripheral blood smear shows no giant cytoplasmic granules in leukocytes. These findings allow GS to be distinguished from Chediak-Higashi syndrome.
- Neurologic evaluations reveal cerebral lymphohistiocytic infiltration and erythrophagocytosis with nonspecific electroencephalographic patterns.24
- Valente et al25 and Smith et al26 noted that polarized light microscopy of hair shafts aids in the differential diagnosis of Chediak-Higashi syndrome and GS.
Procedures
- Biopsy specimens of internal organs can reveal abnormalities.
- Liver biopsy specimens can show marked portal inflammation with focal hepatocellular necrosis.
- Bone marrow aspiration samples can reveal slight hypocellularity with mild erythroid hyperplasia and hemophagocytosis.
Histologic Findings
The common histopathologic findings of GS include prominent, mature melanosomes in skin and hair follicle melanocytes.
GS demonstrates hyperpigmented basal melanocytes and sparse pigmentation of adjacent keratinocytes. This pathology of melanocytes and keratinocytes leads to large, clumped melanosomes in hair shafts, and, as a result, the hair has a silvery-gray sheen. These results can be highlighted in Fontana-Masson–stained sections. Light microscopy shows irregular, large aggregations of melanin pigment in hair.
More on Griscelli Syndrome |
| Overview: Griscelli Syndrome |
Differential Diagnoses & Workup: Griscelli Syndrome |
| Treatment & Medication: Griscelli Syndrome |
| Follow-up: Griscelli Syndrome |
| References |
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References
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Further Reading
Keywords
GS, MIM 214450, partial albinism with immunodeficiency, Griscelli-Prunieras syndrome, Griscelli-Prunieras variant, Griscelli's disease, Griscelli disease
Differential Diagnoses & Workup: Griscelli Syndrome