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A Case of an ALK-positive Histiocytosis of the Cheek in a Young Male Chise Hayashi 1 , Kenji Tsuboi 1 , Hiroshi Furukawa 1 1Department of Plastic and Reconstructive Surgery, Aichi Medical University pp.461-466
Published Date 2026/4/10
DOI https://doi.org/10.18916/keisei.2026040022
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 ALK-positive histiocytosis is an extremely rare histiocytic disease characterized by rearrangement of the ALK gene and positive immunohistochemical staining for ALK. First described in 2008, it was recognized as a hematolymphoid disease in the 5th edition of the WHO Classification of Tumours in 2022. Clinical presentations are diverse, ranging from localized lesions involving a single organ to disseminated disease affecting multiple organs.Therefore, it is strongly recommended to perform a thorough and comprehensive examination following the establishment of a definitive diagnosis. Furthermore, due to the current uncertainty surrounding the long-term prognosis of this condition, careful and extended long-term follow-up may be required to monitor the patientʼs status over time.

 We report a case of ALK-positive histiocytosis presenting in the facial skin of a 15-year-old male. The lesion was excised, and systemic evaluation revealed no evidence of additional involvement. At 15 months postoperatively, the patient remains clinically and radiologically disease-free, with no signs of recurrence or dissemination. Given the rarity of this disease, there are currently no established guidelines regarding the optimal duration or imaging modalities for long-term follow-up, underscoring the need for further accumulation of clinical evidence.


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電子版ISSN 印刷版ISSN 0021-5228 克誠堂出版

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