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- Title
Omental mesenteric myxoid hamartoma, a subtype of inflammatory myofibroblastic tumor? Considerations based on the histopathological evaluation of four cases.
- Authors
Ludwig, K.; Alaggio, R.; Dall'Igna, P.; Lazzari, E.; d'Amore, E.; Chou, P.; d'Amore, E S G; Chou, P M
- Abstract
Omental mesenteric myxoid hamartoma (OMH) is a distinctive myxoid lesion of infancy, characterized by a benign clinical behavior. In the current World Health Organization (WHO) classification of soft tissue tumors, it is considered as part of the morphologic spectrum of inflammatory myofibroblastic tumors (IMT), but this relationship with IMT is still subject to debate. Four lesions with histologic features of OMH occurring in newborns and toddlers are described and compared with classic, ALK-positive IMT. All OMH showed a peculiar dot-like immunostaining for ALK, which, in one of the cases, was cytogenetically found to be associated with an inversion of the ALK gene. While OMHs were positive for smooth muscle actin (SMA), desmin, WT1, podoplanin, and cytokeratins (CAM5.2 and AE1-3), IMT were consistently positive only for SMA (10 cases). ALK-1 displayed cytoplasmic staining in IMT and characteristic paranuclear dot-like staining in OMH.
- Subjects
HAMARTOMA; MYOFIBROBLASTS; INFLAMMATION; WORLD Health Organization; TUMOR classification
- Publication
Virchows Archiv: European Journal of Pathology, 2015, Vol 467, Issue 6, p741
- ISSN
0945-6317
- Publication type
journal article
- DOI
10.1007/s00428-015-1842-4