Atypical spindle cell/pleomorphic lipomatous tumor with pleomorphic hyalinizing angiectatic tumor-like growth pattern

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Case report describing the histological, immunohistochemical, and molecular characteristics of an atypical spindle cell/pleomorphic lipomatous tumor exhibiting a rare pleomorphic hyalinizing angiectatic tumor-like growth pattern, highlighting diagnostic features and differential considerations.

Year: 2020

Institution: Ghent University Hospital, Ghent University

Department: Department of Pathology

Authors: Fleur Cordier, Ann-Sophie Candaele, Jo Van Dorpe, David Creytens

Type of document: Case report

Tumor type: Atypical spindle cell/pleomorphic lipomatous tumor (ASPLT)

Patient age: 59 years

Location of tumor: Right fibula, deep soft tissue

Histological features: Atypical spindle cells, pleomorphic lipoblasts, floret-like giant cells, fibromyxoid stroma, hyalinized congested vessels

Immunohistochemistry: CD34 diffuse, p16 diffuse, Rb loss, SMA focal, desmin focal, S100 fat component, ERG endothelial staining

Molecular findings: RB1 deletion, no MDM2 amplification

Differential diagnosis: Pleomorphic liposarcoma, ALT/WDL

Clinical significance: Recognition of PHAT-like growth pattern in ASPLT

Corresponding author: Prof. Dr. David Creytens, [email protected]

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