Cutis verticis gyrata is characterized by excessive formation of scalp skin. It may
be primary (essential and nonessential) or secondary. In the primary essential form
it presents only folding skin formation on the scalp, mimicking cerebral gyri,
without associated comorbidities. We report a rare case of a 28 year-old male patient
with primary essential cutis verticis gyrata.
Trichilemmoma is a benign neoplasm from the outer sheath of the pilosebaceous
follicle. Desmoplastic trichilemmoma, a rare variant, is histologically characterized
by a central area of desmoplasia that can clinically mimic an invasive carcinoma,
requiring histopathological examination to define the diagnosis.
Focal acral hyperkeratosis is a rare genodermatosis with an autosomal dominant
pattern of inheritance. It is characterized by usually asymptomatic keratotic papules
along the borders of the hands and/or feet. The main differential diagnosis is
acrokeratoelastoidosis of Costa, which differs from the former only by not presenting
elastorrhexis in histopathological examination, thus requiring this exam for a
correct diagnosis.
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