Congenital Hypertrichosis Lanuginosa Workup

Updated: Aug 28, 2018
  • Author: Dirk M Elston, MD; Chief Editor: William D James, MD  more...
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Workup

Laboratory Studies

No laboratory tests are indicated for patients with congenital hypertrichosis.

The diagnosis of congenital hypertrichosis lanuginosa (CHL) is based on clinical and histologic findings, and no laboratory workup is necessary; however, laboratory values may be used to exclude other causes of hypertrichosis.

The diagnosis of Ambras syndrome may be supported by inversions involving breakpoints in the region of band 8q22.

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Imaging Studies

No imaging studies are indicated for patients with congenital hypertrichosis.

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Other Tests

No additional tests are indicated for patients with congenital hypertrichosis.

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Procedures

Hair biopsy for histologic classification is indicated. Biopsy findings may be diagnostic because the type of hair and position of the follicle found on histopathologic analysis can be helpful in excluding alternative diagnoses.

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Histologic Findings

Lanugo hairs tend to be nonpigmented. Vellus hair may be pigmented or nonpigmented. Lanugo and vellus hairs can be difficult to distinguish at histologic examination.

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