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Large plaque parapsoriasis
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Large plaque parapsoriasis

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Contributors: Susan Burgin MD
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Synopsis

Large plaque parapsoriasis : Back, Buttocks, Chest, Leg, Fine scaly plaques
There continues to be debate over the definition and existence of large plaque parapsoriasis (LPP). The term was used historically to designate what was thought to be a chronic inflammatory eruption seen most often in middle-aged and elderly patients, slightly more frequently in men. In older literature 10%-30% of these cases were shown to progress to mycosis fungoides (MF), and so LPP was conceptualized as the inflammatory precursor to MF.

Given that LPP plaques resemble patch stage MF clinically but lack the criteria for the diagnosis of mycosis fungoides histopathologically, many contemporary experts conceptualize LPP to be the same as early patch stage MF and do not employ the term LPP at all. Others, however, do continue to diagnose LPP until the full histopathologic picture of mycosis fungoides is present.

Related topics: Mycosis Fungoides, Small Plaque Parapsoriasis

Codes

ICD10CM:
L41.4 – Large plaque parapsoriasis

SNOMEDCT:
67081008 – Large plaque parapsoriasis

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Differential Diagnosis & Pitfalls

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Last Reviewed:10/30/2016
Last Updated:10/30/2016
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Large plaque parapsoriasis
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A medical illustration showing key findings of Large plaque parapsoriasis : Back, Buttocks, Chest, Leg, Fine scaly plaques
Clinical image of Large plaque parapsoriasis - imageId=41827. Click to open in gallery. caption: 'A close-up of sharply demarcated, scaly, erythematous plaques.'
A close-up of sharply demarcated, scaly, erythematous plaques.

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