Dr mark duffill, dermatologist, waikato hospital, hamilton, new zealand, 2001. Other conditions sometimes grouped under the banner of parapsoriasis are pityriasis lichenoides et varioliformis acuta, pityriasis lichenoides chronica, and lymphomatoid papulosis, all of which are the subjects of separate chapters. Plaque parapsoriasis is a skin condition that resembles psoriasis. About forty years has passed since brocq united under the name parapsoriasis a group of diseases belonging to. Jul 08, 2014 parapsoriasis describes a group of skin diseases that can be characterized by scaly patches or slightly elevated papules andor plaques red, scaly patches that have a resemblance to psoriasis.
Parapsoriasis dermatologic disorders merck manuals. Xanthoerythrodermia perstans is a distinct variant with lesions that are yellow in color 452. It is also known as chronic superficial dermatitis, small plaque parapsoriasis and digitate. Parapsoriasis refers to one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis red, scaly lesions, rather than by their underlying cause. It is caused by an abnormal inflammation of the skin. Age and sex distribution smallplaque parapsoriasis is a rare skin condition that is typically seen in middleaged to older adults in the age group of 3060 years.
Differential diagnosis of parapsoriasis jama dermatology. Small plaque parapsoriasis characteristically occurs with skin lesions that are round, oval, discrete patches or thin plaques, mainly on the trunk 452. These lesions, called plaques, may be irregularly roundshaped to oval and are 10 cm 4 in or larger in diameter. Large plaque parapsoriasis are skin lesions that may be included in the modern scheme of cutaneous conditions described as parapsoriasis. Occasion may arise when nothing is more difficult in dermatology than a differentiation between parapsoriasis and allied conditions which are similar both clinically and histologically. They are considered to be lymphoproliferative in origin, as a number of patients progress to cutaneous tcell lymphoma or mycosis fungoides. The skin lesions appear as scaly patches and plaques. Diagnostic validation of capillary electrophoresis analysis of tcell receptor gammachain gene rearrangements. Pdf parapsoriasis is a dermatological term for a group of chronic erythematosquamous skin disorders, which share similar clinical features and. However, this description includes several inflammatory cutaneous diseases that are unrelated with respect to pathogenesis, histopathology, and. The prognosis of smallplaque parapsoriasis is generally good. The term parapsoriasis refers to a heterogeneous group of uncommon dermatoses occurring mainly in older adults and characterized by erythematous and scaly patches of variable size, chronic course, and resistance to treatment.
Interestingly, two of these lesions with a benign phenotype parapsoriasis en plaque and dermatitis were taken from a patient who was diagnosed with tcell lymphoma 89 years later. Young male with long standing erythematosquamous lesions. Parapsoriasis definition of parapsoriasis by medical dictionary. Eldarouti et al reported on a 7year study of a hypopigmented disorder that the researchers believe should be classified as a new variant of parapsoriasis en plaque. Sep 04, 2019 eldarouti ma, fawzy mm, hegazy ra, abdel hay rm. Parapsoriasis en plaque definition of parapsoriasis en. Hypopigmented parapsoriasis en plaque, a new, overlooked member of the parapsoriasis family.
Confusingly, the term parapsoriasis en plaque has been used for either spp or lpp. Parapsoriasis genetic and rare diseases information center. Eldarouti ma, fawzy mm, hegazy ra, abdel hay rm j am acad dermatol 2012 dec. Chronic superficial scaly dermatitis cssd is an uncommon chronic skin condition characterised by round or oval red, slightly scaly patches on limbs and trunk. Parapsoriasis trastornos dermatologicos manual msd. Parapsoriasis is a term encompassing several disorders of the skin that possess a similar clinical presentation to psoriasis.
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