alexa Follicular mucinosis: a critical reappraisal of clinicopathologic features and association with mycosis fungoides and Sézary syndrome.


Hair Therapy & Transplantation

Author(s): Cerroni L, FinkPuches R, Bck B, Kerl H

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Abstract CONTEXT: Beginning in 1957, patients have been described with localized alopecia characterized histopathologically by mucin deposition within hair follicles (follicular mucinosis [FM]). At least 2 distinct diagnostic entities have been proposed: one occurring in children and young adults without association with other diseases ("idiopathic" FM), the other occurring in elderly patients and associated with mycosis fungoides or Sézary syndrome ("lymphoma-associated" FM). OBJECTIVE: To determine whether idiopathic and lymphoma-associated FM are distinct or related entities. DESIGN: Case series. SETTING: Department of Dermatology, University of Graz, Graz, Austria. PATIENTS: Forty-four patients with FM were divided into 2 groups. Group 1 comprised 16 patients (mean age, 37.5 years) with no associated mycosis fungoides or Sézary syndrome; group 2 was made up of the other 28 (mean age, 52.2 years), who had clinicopathologic evidence of cutaneous T-cell lymphoma. RESULTS: Mean age was lower in patients with idiopathic FM, but a considerable overlapping among the 2 groups was present. Location on the head and neck region was common in both groups, but most patients with lymphoma-associated FM had lesions also on other body sites. In fact, solitary lesions at presentation were common in patients with idiopathic FM (11 [68.8\%] of 16 patients), but uncommon in those with lymphoma-associated FM (2 [7.1\%] of 28 patients). Histopathologic findings did not allow clear-cut differentiation of the 2 groups. Finally, a monoclonal rearrangement of the T-cell receptor gamma gene was demonstrated by polymerase chain reaction analysis in about 50\% of tested cases from each group. CONCLUSIONS: Criteria previously reported to differentiate idiopathic from lymphoma-associated FM proved ineffective. In analogy to localized pagetoid reticulosis (Woringer-Kolopp disease), small-plaque parapsoriasis, and so-called solitary mycosis fungoides, idiopathic FM may represent a form of localized cutaneous T-cell lymphoma.
This article was published in Arch Dermatol and referenced in Hair Therapy & Transplantation

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