Naevoid hypertrichosis

Nevoid hypertrichosis: case report with review of the literature

Nevoid hypertrichosis is a rare entity characterized by circumscribed patches of terminal hair. It is associated with many cutaneous and extra-cutaneous abnormalities. In our case, a single circumscribed patch of terminal hair growth was present without any underlying or associated cutaneous or systemic abnormalities.

Multiple nevoid hypertrichosis as an isolated developmental defect

A 3-year-old girl presented with longer hair on the left side of her scalp, coarse hair of abnormal length on her extremities, and a tuft of hair in the lumbosacral region, with all hair distributed on normally pigmented skin. Neither similar or relevant family history nor associated extracutaneous abnormalities was detected after a thorough examination. Clinical diagnosis of patchy nevoid hypetrichosis was confirmed by histology. Nevoid hypertrichosis is a rare hair growth disorder that usually presents at or soon after birth. It is characterized by patches of hypertrichosis distributed in a segmental pattern. It may be accompanied by mental, ocular, or myoskeletal abnormalities. Cases of nevoid hypertrichosis with multiple patches presenting as a solitary developmental defect have been rarely described in the literature.

Linear nevoid hypertrichosis without underlying hypopigmentation or extracutaneous abnormalities

An 8-year-old Caucasian girl presented with a linear patch of excessive hair growth involving her left posterolateral leg without any underlying hypopigmentation or associated abnormalities. This is an unusual presentation given that the literature describing nevoid hypertrichosis in a linear distribution is associated with either underlying skin or hair hypopigmentation or other extracutaneous manifestations.

Giant nevoid hypertrichosis in an Iranian girl

A 12-year-old Iranian girl and her father had an extensive congenital nevus consisting of long, black terminal hair involving the entire back and the posterior surface of the arms without pigmentary changes of the underlying skin. A physical examination revealed no other abnormalities. In this study the possibility of a genetically determined etiology is considered.

Nevoid hypertrichosis with multiple patches of hair that underwent almost complete spontaneous resolution

Four cases with multiple patches of nevoid hypertrichosis have been reported. This fifth patient had multiple patches of nevoid hypertrichosis that underwent almost complete spontaneous resolution. Areas of unaffected skin showed depigmentation that followed the lines of Blaschko.

A case of multiple nevoid hypertrichosis

Nevoid hypertrichosis is an uncommon congenital disorder consisting of terminal hair growth in a localized distribution on flesh-colored skin; it is not associated with any other systemic abnormalities. A 21-year-old male patient had a circumscribed area of depigmented terminal hairs on his chest which had been present since 1 year of age. At the age of 18, similar lesions developed on his left shoulder and upper arm. The underlying skin was slightly hypopigmented, and no other systemic abnormalities were found. Histologic examination demonstrated terminal hair follicles in otherwise normal skin. The number of HMB 45 positive melanocytes was markedly decreased in the affected skin. This case of multiple nevoid hypertrichosis is reported with a review of previously reported cases.

Hypertrichosis "cubiti" with facial asymmetry

Hypertrichosis of the elbow region may be the only abnormality in hypertrichosis cubiti (hairy elbow syndrome). Only 6 cases have been reported; 2 Amish sibs also had additional short stature and, in the most recent case report, a patient had asymmetry of the face, generalized hypotonia, ptosis, epicanthic folds, highly arched palate, and delayed growth and development. The child reported here also had asymmetry of facial growth, ptosis, delayed speech development, and hypertrichosis in a patchy distribution which included the elbow regions, face, trunk, and thighs. There was no family history of hypertrichosis, and the karyotype of cultured fibroblasts was normal in the skin of an area of hypertrichosis. These patients appear to have a distinct condition compared to other hypertrichosis syndromes.

Nevoid hypertrichosis: multiple patches associated with premature graying of lesional hair

A 23-month-old Caucasian girl had congenital circumscribed areas of deeply pigmented terminal hairs that gradually lost their pigment over the next two years. Physical examination revealed no other abnormalities. Histologic examination demonstrated terminal hair in otherwise normal skin consistent with nevoid hypertrichosis. The clinical and histologic characteristics of nevoid hypertrichosis are compared with other types of hypertrichotic patches.