PMID- 18942305 OWN - NLM STAT- MEDLINE DCOM- 20081126 LR - 20171116 IS - 0300-5283 (Print) IS - 0300-5283 (Linking) VI - 63 IP - 2 DP - 2008 Jun TI - Small cell variant of anaplastic large cell lymphoma with positive immunoreactivity for CD99. PG - 150-1 AB - A 13 year old boy presented with a huge mass on his right arm of 6 months duration. Histopathological examination revealed sheets of malignant small round blue cells with immunopositivity for LCA, CD43, CD45Ro, CD30, EMA, ALK-1 and CD99, and negativity for CD20, TdT, myogenin, myoD1, NSE, bcl-6, bcl-2 and CD10. Fluorescent In-Situ Hybridization (FISH) testing excluded the diagnosis of Ewing's sarcoma/PNET. Pathologists need to be aware of the diagnosis of a small cell variant of ALCL, as well as of the fact that CD99 expression commonly occurs in cases of ALK-positive ALCL, in order to distinguish this entity from Ewing's sarcoma/PNET. FAU - Shiran, M S AU - Shiran MS AD - Department of Pathology, Universiti Putra Malaysia, Serdang, Malaysia. mshiran@yahoo.com FAU - Tan, G C AU - Tan GC FAU - Sabariah, A R AU - Sabariah AR FAU - Chye, P C AU - Chye PC FAU - Pathmanathan, R AU - Pathmanathan R LA - eng PT - Case Reports PT - Journal Article PL - Malaysia TA - Med J Malaysia JT - The Medical journal of Malaysia JID - 0361547 RN - 0 (12E7 Antigen) RN - 0 (Antigens, CD) RN - 0 (CD99 protein, human) RN - 0 (Cell Adhesion Molecules) SB - IM MH - 12E7 Antigen MH - Adolescent MH - Antigens, CD/*immunology MH - Arm MH - Cell Adhesion Molecules/*immunology MH - Humans MH - Lymphoma, Large B-Cell, Diffuse/*immunology/pathology MH - Male MH - Soft Tissue Neoplasms/*immunology/pathology EDAT- 2008/10/24 09:00 MHDA- 2008/12/17 09:00 CRDT- 2008/10/24 09:00 PHST- 2008/10/24 09:00 [pubmed] PHST- 2008/12/17 09:00 [medline] PHST- 2008/10/24 09:00 [entrez] PST - ppublish SO - Med J Malaysia. 2008 Jun;63(2):150-1.