Pityriasis Rotunda Diagnosed in Canada: Case Presentation and Review of the Literature

Abstract

Background: Pityriasis rotunda is a rare cutaneous disorder characterized by scaly, circular, well-demarcated, hypo-or hyperpigmented, fine plaques over the trunk and extremities.Objective: We present a case of pityriasis rotunda in a 44-year-old African-Canadian woman who presented to a community dermatology practice in Toronto.Results: Pityriasis rotunda has been well described in Japan, Italy, and South Africa. It is extremely rare in North America, with nine reported cases to date, the majority of which were diagnosed in the United States.Conclusion: Pityriasis rotunda is a rare cutaneous disorder associated with systemic disease. To the best of our knowledge, this is the second report of pityriasis rotunda diagnosed in Canada.Contexte: Le pityriasis rotunda est une affection cutané e rare, qui se caracté rise par de fines plaques circulaires, bien circonscrites, squameuses, hypo-ou hyperpigmenté e, qui couvrent le tronc et les membres.Objectif: Il sera question, dans l'article, du cas d'une Afro-canadienne de 44 ans, atteinte de pityriasis rotunda, qui consulté en dermatologie communautaire, à Toronto.Ré sultats: Le pityriasis rotunda est bien connu au Japon, en Italie, et en Afrique du Sud. Il est rarissime en Amé rique du Nord; seuls neuf cas ont é té signalé s jusqu'à maintenant, et la majorité d'entre eux se trouve aux É tats-Unis.Conclusions: Le pityriasis rotunda est une affection cutané e rare, associé e à une maladie gé né rale. À notre connaissance, il s'agit du deuxiè me cas de pityriasis rotunda diagnostiqué au Canada.

A Circular Rash in a Teenager

“…It is estimated that 30% of cases are associated with malignancy. 5 There have been a few cases associated with various other cancers, including multiple myeloma. 6 It has also been associated with systemic illnesses such as malnutrition, 7 anorexia nervosa, 8 and mycobacterial diseases.…”

Pitiriasis rotunda en Colombia

“…La pitiriasis rotunda es una enfermedad rara de patogénesis desconocida, que usualmente se considera idiopática, aunque puede presentarse como parte de un síndrome paraneoplásico o asociada a enfermedades infecciosas sistémicas [1][2][3] . Se ha descrito principalmente en África, Italia y Japón; los reportes en población latinoamericana son escasos y usualmente se presenta en pacientes con fototipos oscuros.…”

“…En la histopatología se observa hiperqueratosis, ortoqueratosis, acantosis regional, con ausencia o reducción de la capa granular e hiperpigmentación de la capa basal debido al fototipo en el que usualmente se ha descrito 1,2,3 .…”

“…Entre los diagnósticos diferenciales se debe considerar la tiña versicolor, el eritrasma, la lepra, la erupción fija, la pitiriasis alba y la pitiriasis rosada 5 . En cuanto al tratamiento, se han descrito los tópicos con retinoides, ácido salicílico y ácido láctico, sin conocerse su efectividad en estudios controlados, debido a la rareza de la enfermedad 2,7 .…”

Pityriasis rotunda associated with hepatocellular carcinoma

“…1,2 Additionally, several comorbidities associated with PR have been reported as follows: diabetes mellitus, infections (tuberculosis, leprosy, osteitis), liver diseases (cirrhosis), chronic obstructive pulmonary disease, heart disease, glucose-6-phosphate dehydrogenase deficiency (favism), scleroderma and hormonal disorders such as hyperprolactinemia. [1][2][3][4][5] Clinically, typical lesions of PR are characterized by sharply defined annular patches of dry skin with ichthyosiform scaling, usually 2-3 cm in diameter. The number of lesions is variable.…”