Pediatric Dermatology Vol. 28 No. 6 715–719, 2011
Phacomatosis Pigmentokeratotica: A Further Case without Extracutaneous Anomalies and Review of the Condition
Rattanavalai Chantorn, M.D.,*, and Tor Shwayder, M.D.
*Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok Thailand, Department of Dermatology, Henry Ford Hospital, Detroit, Michigan
Abstract: Epidermal nevus syndrome is the term for the association of an epidermal nevus and extracutaneous anomalies, including neurologic, ophthalmic, and skeletal defects. Epidermal nevus syndromes include different disorders that share the feature of mosaicism. Phacomatosis pigmentokeratotica (PPK) is a distinctive new epidermal nevus syndrome first described in 1996 characterized by the presence of multiple organoid nevi with sebaceous differentiation, a speckled lentiginous nevus, and skeletal and neurologic abnormalities. Only a handful of cases of PPK without extracutaneous manifestations have been reported. We report here an individual with PPK with only cutaneous signs and confirm this dis- tinctive syndrome has two subtypes according to the presence or absence of extracutaneous involvement.
Happle et al (1) first proposed the term ‘‘phacoma- reported. Approximately 30 cases of PPK have been tosis pigmentokeratotica’’ (PPK), which is characterized reported. Seven of all reported cases have no systemic by the cooccurrence of organoid nevus with sebaceous abnormalities described (5–8). We report an 18-year-old differentiation arranged along Blaschko’s lines, and woman with unilateral papular nevus spilus with Spit- speckled lentiginous nevus (SLN) of the papular type zoid features associated with ipsilateral congenital nevus (papular nevus spilus) arranged in a checkerboard pat- sebaceous and contralateral linear epidermal nevus. tern (2). Phacomatosis pigmentokeratotica is divided There have not been extracutaneous anomalies or into two subgroups according to the presence or absence malignant transformation detected during our 18-year of extracutaneous involvements. Happle (3) explained follow-up of this patient. that this syndrome represented an example of the genetic mechanism didymosis, or twin spotting. The two com- CASE REPORT ponents of this twin spot phenomenon have been iden- tified as Schimmelpennning syndrome and SLN A healthy 18-year-old white woman was born with a syndrome. The occurrence of a neoplasm arising in nevus giant yellow–orange plaque involving the left side of her sebaceous such as basal cell carcinoma (4) and papular scalp and face extending to the ear and posterior neck nevus spilus such as malignant melanoma (4) has been (Fig. 1), along with involvement of the right side of her
Address correspondence to Tor Shwayder, M.D., Director, Department of Dermatology, Henry Ford Hospital, Detroit MI 48202, or e-mail: [email protected].
DOI: 10.1111/j.1525-1470.2011.01655.x