2. The word ichthyosis comes from the Greek word for
a fish.
ichthyosis : is a group of disorders that are
characterized by a persistent, non-inflammatory
scaling disorder of the skin surface.
It is caused by abnormality in keratinization and
exfoliation of the horny cell layer.
3. The ichthyoses are a clinically and genetically
heterogeneous group of skin disorders,
characterized by a diffuse, generally uniform and
persistent pattern of scaling without mucosal or
extracutaneous (except in ichthyosiform syndromes)
involvement.
4.
5. Acquired ichthyosis is clinically indistinguishable
from hereditary ichthyosis; however, acquired
ichthyosis is associated with various systemic
diseases.
The appearance of ichthyosis in adulthood can
occur before or after the diagnosis of a systemic
condition.
8. nutritional disorders
chronic renal failure
bone marrow transplantation
HIV infection
Autoimmune diseases, including systemic lupus
erythematosus and dermatomyositis
9. certain medications has been linked to acquired
ichthyosis
nicotinic acid, triparanol,
butyrophenones, dixyrazine,
cimetidine, and clofazimine
11. 24 cases
Lethal, AR
Prematurity, fixed facial
expression, micrognathia, mouth in “O”
position
Rigid and tense skin with erosions and
denudations & multiple joint
contractures
12. Disorder of keratinization in which bizzare
migratory annular and polycyclic patches
occur
Leave no scarring or pigmentary changes.
Inheritance AR, patients are born
erythrodermic
fatal complications.
13. Most also have trichorrhexis invaginata
May clear completely in summer time
14.
15. Ichthyosis, Myopathy
and lipid vacuoles ->
Impaired degradation
of triacylglycerol-
derived diacylglycerol
Dietary modulation of
fats aids in controlling
the disease Lipid vacuoles in granulocytes and monocytes
but not lymphocytes or erythrocytes
16. IFAP = Ichthyosis
Follicularis, Alopecia, Photophobia
Generalized spiny follicular lesions with xerosis
of non-follicular skin, striking alopecia.
M>F 5:1
X-linked recessive and AD forms reported
17. Fatty alcohol oxidoreductase deficiency
Infancy: generalized
erythroderma, ichthyosis, fine to large lamellar
scaling
After Infancy: generalized darker scale without
erythema accentuated in flexures and lower
abdomen; spares central face.
28. Leathery verrucous plaques
Nails may be dystrophic
Eye brows and eye lashes absent
Partial anhidrosis
Hypotrichosis
A/w Mucocutaneous candidiasis.
29. Cong Hemidysplasia
Ichthyosiform erythroderma
Limb defects
Present at birth,females affected
Ichthyosis confined to one half of body &
ipsilateral hypoplasia of bony structures
and brain.