Indeterminate cell histiocytosis(LCH) is an uncommon proliferative illness where the predominant cells have characteristics from both non-Langerhans cell histiocytosis (NLCH) and Langerhans cell histiocytosis (LCH) in terms of morphology and immunophenotypic characteristics.[1] Wood et al. originally described ICH in 1985 as a neoplastic disease arising from dermal indeterminate cells that lack Birbeck granules but are characteristically positive for S-100 and CD1a.[2]
Signs and symptoms
Clinically, ICH is defined by pink to reddish, varying-sized, painless, non-itching papules or nodules that develop on otherwise healthy skin (sparing mucosae). These lesions can appear as a single, distinct group of lesions, or several generalized papules dispersed over the trunk, face, and limbs. They can also show signs of stable disease, remission and recurrence, or spontaneous remission.[3]
Causes
Possible causes include scabies,[4] mosquito bites,[5] and a clonal drive.[6]
^Vener, C.; Soligo, D.; Berti, E.; Gianelli, U.; Servida, F.; Ceretti, E.; Caputo, R.; Passoni, E.; Lambertenghi Deliliers, G. (2007). "Indeterminate cell histiocytosis in association with later occurrence of acute myeloblastic leukaemia". British Journal of Dermatology. 156 (6). Oxford University Press (OUP): 1357–1361. doi:10.1111/j.1365-2133.2007.07880.x. ISSN0007-0963. PMID17459045. S2CID41005413.
^WOOD, GARY S.; HU, CHUNG-HONG; BECKSTEAD, JAY H.; TURNER, RODERICK R.; WINKELMANN, R. K. (1985). "The Indeterminate Cell Proliferative Disorder: Report of a Case Manifesting as an Unusual Cutaneous Histiocytosis". The Journal of Dermatologic Surgery and Oncology. 11 (11). Wiley: 1111–1119. doi:10.1111/j.1524-4725.1985.tb01399.x. ISSN0148-0812. PMID3902927.
^Berti, Emilio (August 1, 1988). "Unusual Cutaneous Histiocytosis Expressing an Intermediate Immunophenotype Between Langerhans' Cells and Dermal Macrophages". Archives of Dermatology. 124 (8). American Medical Association (AMA): 1250. doi:10.1001/archderm.1988.01670080062020. ISSN0003-987X. PMID3401031.
Zanella, Simone; Berti, Emilio; Bonometti, Arturo; for Associazione Italiana Ricerca Istiocitosi ONLUS (2023). "Indeterminate cell histiocytosis: A systematic review of the literature with a comprehensive revision of clinical, histopathological, and molecular features". Journal of the European Academy of Dermatology and Venereology. 37 (8): 1559–1575. doi:10.1111/jdv.19095. ISSN0926-9959. PMID37016977. S2CID257954148.