Solitary Fibrous Tumors and So-Called Hemangiopericytoma

Table 2

Characteristics of the paediatric cases reported in the literature.

Ref.	Location	Age	Size macroscopic aspect	Histology and immunohistochemistry	Outcome
[12]	Mesentery	6 y.o.	10 × 8 × 7 cm; Well-defined solid mass; Encapsulated tumor; Solid and cystic parts	Uniform hypercellular areas of pleomorphic spindle cells intermixed with a dense collagenous stroma with few necrotic areas.; 25 mitoses per 50 HPF; (i) CD34 positive; (ii) NSE positive; (iii) DOG-1, Bcl-2, CD117, desmin, S-100 protein, and SMA negative.	No lymph node metastasis was present at diagnosis.; Liver metastasis after 8 months
[13]	Pleura	7 y.o.	5 × 5 × 4 cm; Well-demarcated nodular mass	Low cellularity; (i) CD34, vimentin and bcl2, positive; (ii) Cytokeratin, SMA, desmin, and S100 negative	No metastasis.; No evidence of tumor recurrence 9 months later
[14]	Orbit	15 y.o.	1.5 × 1.4 × 1.0 cm; Well-circumscribed mass; Highly vascular	Highly cellular spindle tumor; 2 mitoses per 20 HPF; (i) AE1/AE2 cytokeratin, smooth-muscle actin, muscle-specific actin, desmine, S100 negative; (ii) CD34. and vimentin positive	No metastasis; No recurrence after local radiotherapy