case_images: PMC7178868_01
case_images: Clinical findings and MRI images. (A) A reddish mass of 4-mm diameter is seen under the nail plate (area surrounded by the triangle mark). Distal nail splitting is observed in the left thumb. (B) T1-weighed magnetic resonance image shows tumor with normal intensity. (C) T2-weighed magnetic resonance image shows high-intensity lesion. Flow void is indicated by an arrow. MRI: magnetic resonance imaging.
case_images: ICRP_A_1750018_F0001_C.jpg
case_images: PMC7178868_01_ICRP_A_1750018_F0001_C.jpg
case_images: F0001
case_images: The tumor was 4 mm in diameter and the nail bed proximal to the tumor was slightly elevated (Figure 1(A)). The tumor presented with normal intensity on T1-weighed image (Figure 1(B)) and was hyperintense on T2-weighed image (Figure 1(C)).
case_images: Surgical findings. (A) A reddish mass is seen under the nail plate. The excision line after the nail claw is indicated in blue. (B) After excision, skin grafting was performed from the thenar eminence.
case_images: ICRP_A_1750018_F0002_C.jpg
case_images: PMC7178868_01_ICRP_A_1750018_F0002_C.jpg
case_images: F0002
case_images: The tumor could be resected completely (Figure 2(A)). The defective nail matrix was reconstructed with a glabrous dermal graft (Figure 2(B)) taken from the thenar of the right thumb.
case_images: Histopathological findings. (A) A loupe image. An incompletely encapsulated tumor. (B) A middle-power view. The tumor is composed of fine collagen fibers pointed in every direction. (C) A high-power view. Nuclei of the proliferating cells are spindle- or comma-shaped. Among the tumor cells, capillaries and a small number of mast cells are dispersed (indicated by arrows). (D) Appearance of new thumb nail six months postoperatively. This observation is natural.
case_images: ICRP_A_1750018_F0003_C.jpg
case_images: PMC7178868_01_ICRP_A_1750018_F0003_C.jpg
case_images: F0003
case_images: Histological examination of the excised specimen showed an incompletely encapsulated eosinophilic fibrous tumor (Figure 3(A)). The tumor was composed of fine collagen fibers with numerous scattered cells with spindle- and comma-shaped nuclei (Figure 3(B,C). A small number of the mast cells were observed within the tumor (Figure 3(C)). Postoperatively, the nail re-grew with a good cosmetic result (Figure 3(D)).