01419nas a2200193   4500000000100000008004100001653002200042653001400064653001400078653001600092100001400108700001400122700001700136700001300153245007700166490000900243520095900252022001401211       2014                            d10aMycosis Fungoides10aChildhood10adiagnosis10aSkin biopsy1 aGameiro A1 aGouveia M1 aTellechea Ó1 aMoreno A00aChildhood hypopigmented mycosis fungoides: a commonly delayed diagnosis.0 v20143 a<p>Primary cutaneous lymphomas (PCLs) are exceedingly rare in children and adolescents, with mycosis fungoides (MF) being the most frequent PCL diagnosed in childhood. There are numerous unusual clinical variants of MF, including the hypopigmented type form (HMF). HMF is exceptional overall, but comparatively common among children. We present an 8-year-old boy with a 3-year history of progressive, generalised, scaly, hypopigmented round patches and few erythematous papules. He was first diagnosed with pityriasis alba (PA), and moisturisers were prescribed with no improvement. Skin biopsy showed typical features of MF, and the patient was successfully treated with narrowband ultraviolet B. HMF may simulate atopic dermatitis, PA, pityriasis lichenoides, tinea versicolour, vitiligo, postinflammatory hypopigmentation or leprosy. Therefore, persistent and unusual hypopigmented lesions should be biopsied to rule out this rare variant of MF.</p>
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