Giant Bilateral Becker Nevus: A Rare Presentation

Abstract

A 14-year-old boy had giant confluent brown patches that were bilaterally distributed on his back, chest, and upper arms, and partially covered by dark coarse hairs. A clinical diagnosis of Becker nevus was made and confirmed histopathologically. We report this patient for the rarity of presentation. Different clinical features of Becker nevi, associated findings, differential diagnoses, and treatment options are discussed.

Síndrome do nevo de Becker: relato de caso

“…2 The proportion between the male and female sexes has been already described as 2:1. 4,6 However, Happle and Koopman believe that the prevalence is the same between sexes and suggest that the disease among women as it is more discrete is underdiagnosed. 3 On average, lesions occur around eight years of age and become more evident in puberty.…”

“…5,6 In some cases it is found hyperplasia of smooth muscle fibers arranged in a disorganized way in the reticular dermis, Baeta IGR, Viotti CV, Pereira ACF, Costa SR Jr, Bittencourt FV corresponding to a hamartoma. 4,7 The majority of the authors attribute an spectral concept to the Becker's nevus and to the smooth muscle hamartoma. [6][7][8][9] The etiopathogenesis is not clear yet.…”

“…1 Since then various cases have been described in the medical literature including reports of multiple or bilateral cases. 4,5 In 1981, Tymen et al estimated a prevalence of 0,5% in young (age varying from 17 to 26 years) male patients. 2 The proportion between the male and female sexes has been already described as 2:1.…”

“…Although the majority of cases is sporadic it has been reported family occurence explained as a type of para-dominant inheritance. 4 It is also considered the hypothesis of a hormone-dependent disorder based on the increase of the number of androgen-receptors in the affected areas, that would explain the appearing of lesions in puberty and alterations such as hyper trichosis and acneform eruptions restricted to the affected regions. 5 The differential diagnosis includes post-inflammatory hyperpigmentation ,congenital melanocytic nevus, congenital hamartoma of smooth muscle fibers and spots of white coffee colour.…”

“…1 It is located predominantely on the anterior trunk or on the scapular region , [1][2][3] but it can be located in other areas of the body. 4 Although there have been reports of multiple or bilateral cases, the lesion is generally unique and bilateral. Becker´s nevus syndrome is associated with other cutaneous anomalies, musculoskeletal or maxillofacial.…”