A Case of Lichen Striatus. A Histopathological Study.

DOI 11 References
  • MIZUNO Takashi
    Department of Dermatology, Yokohama City University School of Medicine
  • ISHII Norihisa
    Department of Dermatology, Yokohama City University School of Medicine
  • NAKAJIMA Hiroshi
    Department of Dermatology, Yokohama City University School of Medicine

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Other Title
  • 線状苔せん　　その病理組織学的検討
  • —A Histopathological Study—
  • —その病理組織学的検討—

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A 14-year-old male with linear and discrete eruptions on the left buttocks, the back of the left lower limb, and the second interdigit of the left foot is described. Each eruption appeared to be an almost circular scaly erythema measuring from 10∼30 mm in diameter and was accompanied by slight itching. Histopathologically, parakeratosis was observed with a loss of the granular layer, elongation of the papillary process, Munro’s microabscess in the horny layer, and patchy perivascular infiltration of inflammatory cells in the superficial dermis. We thus considered a possible diagnosis of linear psoriasis, lichen striatus, and linear lichen planus. However, the existence of linear psoriasis remains controversial and case reports of “true” linear psoriasis are extremely rare. In cases of “true” linear psoriasis, eruptions are scattered widely. In our case, the eruptions improved gradually by ointment therapy and there was no recurrence. We therefore ruled out the possibility of linear psoriasis. In addition, since the patient was a child, the infiltration pattern of inflammatory cells was perivascular, and lichen striatus is known to show various histopathological patterns and sometimes resembles psoriasis, we thus decided this case to be lichen striatus rather than linear lichen planus. Based on the above findings, we believe that a differential diagnosis of lichen striatus thus needs both clinical and histopathological evidence.

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