Study (year of publication) of casesAge (years) Gender Tumor location Size (cm) Immunohistochemical markers (1) Maeda et al. (1989) [10 ] 1 37 M Upper lip 0.7 × 0.8 Vimentin+, desmin+, factor VIII+ S-100- , NSE+ (2) Maeda and Osaki (1989) [11 ] 1 49 F Cheek 2.0 × 2.0 Vimentin+, desmin+, factor VIII+ S-100- (3) Anastassov and Damme (1995) [12 ] 1 51 M Upper lip 1.5 × 1.0 SMA+, factor VIII- (4) Toida et al. (2000) [13 ] 1 10 M Lower lip 2.0 × 1.5 SMA+, S-100- (5) Marden et al. (2004) [14 ] 1 25 M Tongue 3.2 × 3.0 × 1.2 SMA+, CD34+ , CD31+ (6) Manor et al. (2007) [15 ] 1 39 M Buccal mucosa 3.5 × 3.3 × 2.0 SMA+ (7) Scheper et al. (2007) [16 ] 1 67 M Palate 5.0 × 5.0 SMA+ (8) Suresh et al. (2007) [17 ] 1 51 F Mandible 1.7 × 1.5 SMA+, vimentin+, CD34- , S-100- (9) Cepeda et al. (2008) [18 ] 5 39 27 43 36 48 F F F M M Retromolar area Mandible Lower lip Upper lip Upper lip 0.9 × 0.6 × 1.0 1.4 × 1.3 × 1.0 0.7 × 0.5 × 0.4 1.5 × 1.0 × 1.0 1.7 × 1.0 × 1.0 SMA+, vimentin+, desmin+, CD34- , S-100- SMA+, vimentin+, desmin+, CD34- , S-100- SMA+, vimentin+, desmin+, CD34- , S-100- SMA+, vimentin+, desmin+, CD34- , S-100- SMA+, vimentin+, desmin+, CD34- , S-100- (10) Keerthi et al. (2009) [19 ] 1 32 M Cheek 4.5 × 4.0 SMA+ (11) Grossman et al. (2009) [20 ] 1 35 F Palate 1.0 × 1.0 × 0.5 SMA+, vimentin+, desmin+, S-100- , HHF-35+, AE1/AE3- (12) Kim et al. (2010) [21 ] 1 2 months Not reported Tongue 2.5 × 2.0 SMA+, vimentin-, desmin+, S-100- (13) Kim et al. (2010) [22 ] 1 51 M Buccal space 3.0 × 3.0 SMA+, CD34- , S-100- (14) Nonaka et al. (2011) [23 ] 1 39 M Tongue 2.0 ∅ SMA+ (15) Gueiros et al. (2011) [24 ] 3 54 66 54 M M M Lower lip Upper lip Upper lip 1.0 × 1.0 Not reported 0.8 × 0.5 × 0.5 SMA+, desmin+, CD34+ , S-100+ , HHF-35+, D2-40- SMA+, desmin+, CD34+ , S-100- , HHF-35+, D2-40- SMA+, desmin+, CD34+ , S-100+ , HHF-35+, D2-40- (16) Patil et al. (2011) [25 ] 1 57 M Lower left back tooth region 3.0 × 1.5 × 1.0 SMA+, vimentin+, desmin+, S-100- (17) Menditti et al. (2012) [26 ] 1 14 M Lingual mucosa of mandible 1.0/2.0 ∅ SMA+ (18) Eley et al. (2012) [27 ] 1 39 M Palate 2.0 ∅ Desmin+, actin+ (19) Liu et al. (2014) [28 ] 14 62 49 36 51 49 10 30 20 60 34 58 18 19 47 F M F F F F F M M M M M M M Buccal mucosa Buccal mucosa Buccal mucosa Buccal mucosa Palate Mandible Buccal mucosa Gingiva Palate Palate Lip Palate Tongue Buccal mucosa 1.5 ∅ 2.0 ∅ 2.0 ∅ 1.0 ∅ 1.0 ∅ 3.5 ∅ 3.0 ∅ 2.5 ∅ 1.5 ∅ 1.0 ∅ 6.0 ∅ 3.5 ∅ 3.5 ∅ 2.0 ∅ SMA+, vimentin+, desmin+, CD34+ in all cases S-100+ only in 3 cases (not specified) (20) Tsuji et al. (2014) [3 ] 1 79 M Palate 1.5 × 1.5 SMA+, desmin+ (21) Ishikawa et al. (2014) [29 ] 1 51 M Tongue 1.1 ∅ SMA+, vimentin+, desmin+, CD34- , S-100- , HHF-35+ (22) Ranjan and Singh (2014) [30 ] 1 45 F Gingiva 3.0 × 3.0 SMA+ (23) Inaba et al. (2015) [31 ] 1 45 F Cheek Not reported SMA+, factor VIII+ (24) Osano et al. (2015) [9 ] 1 45 M Cheek 2.0 ∅ SMA+, vimentin+, desmin+, CD34- , S-100- (25) Arpağ et al. (2016) [32 ] 2 25 55 M F Gingiva Gingiva 0.5 × 0.5 1.5 × 2.0 SMA+ SMA+ (26) Bajpai et al. (2016) [33 ] 1 39 M Gingiva 3.0 × 3.0 SMA+, vimentin+, desmin+ (27) Hassona et al. (2017) [4 ] 1 52 F Upper lip Not reported SMA+ (28) Rawal and Rawal (2017) [8 ] 1 70 M Palate 2.0 × 1.5 SMA+ (29) Matiakis et al. (2018) [7 ] 1 51 M Labial mucosa of the upper lip 0.8 ∅ SMA+, h-caldesmon+ (30) Aitken-Saavedra et al. (2018) [34 ] 14 Total mean 45.2 Lower lip Lower lip Lower lip Lower lip Upper lip Upper lip Upper lip Buccal mucosa Buccal mucosa Buccal mucosa Buccal mucosa Soft palate Soft palate Hard palate Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported Not reported SMA+, AE1/AE3-, CD68- , desmin+, S-100- in all cases CD34+ only in 10 cases (not specified) Case report 1 17 F Cheek 1.5 × 1.0 SMA+, vimentin+, desmin+, CD34+