Lentigo, reticular - Altmeyers Encyclopedia

Synonym(s)

Ink-spot lentigo; Reticulated black solar lentigo

Definition
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Deep dark, melanocytic nevus clinically resembling a malignant melanoma.

Etiopathogenesis
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Solar pollution. Can also be observed after PUVA therapy, but PUVA lentigines usually occur multiple times, while the ink-spot lentigo occurs mainly solitary.

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Manifestation
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Almost exclusively occurring in adults.

Localization
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Especially back and shoulder parts.

Clinical features
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Pinhead to o.5 - 1.0 cm large, sharply defined pigmentation with irregular, light to dark brown, net-structured pigmentation.

Reflected light microscopy: Regular, prominent pigment net, possibly central diffuse pigmentation. No black dots, brown globules or pseudopodia.

Histology
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Sharply defined distinct, focally homogeneous, basal pigmentation of the epidermis with increased number of melanocytes. Lengthened and widened retele bands. Suprapapillary epidermis parts are only slightly pigmented.

Differential diagnosis
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Verruca seborrhoica; initial malignant melanoma.

Literature
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Bolognia JL (1992) Reticulated black solar lentigo ('ink spot' lentigo). Arch Dermatol 128: 934-940
Haas N et al (2002) Detection of a novel pigment network feature in reticulated black solar lentigo by high-resolution epiluminescence microscopy. At J Dermatopathol 24: 213-217
Kaddu S et al (1997) Reticular lentigo. dermatologist 48: 181-185
Smith SR, O'Grady TC (1996) Reticulated ephelides: 'inkspots' revisited. Arch Dermatol 132: 353-354