BACKGROUND: Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is a congenital hamartoma that has rarely been documented. OBJECTIVES: To describe the clinical and histological features of 10 patients with PEODDN. METHODS: A retrospective study of 10 patients with PEODDN attended in our paediatric hospital between 1999 and 2009 was performed. The clinical and histopathological features were reviewed. RESULTS: Nine children and one adult were included in the study. In 6 cases the lesion was present at birth and they were unique in 5 cases and systematized in the other 5 cases. Two cases in the same family are reported. The lesions were most commonly found on the extremities, although the palms or soles were involved in 9 cases and only in one case there was not affection of this area. The lesions were mostly asymptomatic but there was moderate itching in two cases. Clinical examination revealed no extracutaneous involvement. CONCLUSIONS: PEODDN is a rare disorder that usually appears at birth or early childhood. It has a linear distribution following the Blaschko lines. To our knowledge this is the largest series reported in English literature and we also describe the first family case.
BACKGROUND: Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is a congenital hamartoma that has rarely been documented. OBJECTIVES: To describe the clinical and histological features of 10 patients with PEODDN. METHODS: A retrospective study of 10 patients with PEODDN attended in our paediatric hospital between 1999 and 2009 was performed. The clinical and histopathological features were reviewed. RESULTS: Nine children and one adult were included in the study. In 6 cases the lesion was present at birth and they were unique in 5 cases and systematized in the other 5 cases. Two cases in the same family are reported. The lesions were most commonly found on the extremities, although the palms or soles were involved in 9 cases and only in one case there was not affection of this area. The lesions were mostly asymptomatic but there was moderate itching in two cases. Clinical examination revealed no extracutaneous involvement. CONCLUSIONS: PEODDN is a rare disorder that usually appears at birth or early childhood. It has a linear distribution following the Blaschko lines. To our knowledge this is the largest series reported in English literature and we also describe the first family case.