case_images: PMC9887288_01
case_images: Preoperative view showing the swelling, redness, and tenderness on the eponychium of the left index finger.
case_images: fsurg-09-1008358-g001.jpg
case_images: PMC9887288_01_fsurg-09-1008358-g001.jpg
case_images: F1
case_images: Physical examination showed obvious swelling, redness, and tenderness on the eponychium of the left index finger, with nail root deformity, which looked similar to a clubbing finger, and the remaining fingers appeared normal (Figure 1).
case_images: MRI of the distal phalanx of the left index finger. T1 (A) and T2 (B,C) showing a well-defined osteolytic lesion with a clear boundary.
case_images: fsurg-09-1008358-g002.jpg
case_images: PMC9887288_01_fsurg-09-1008358-g002.jpg
case_images: F2
case_images: Magnetic resonance imaging (MRI) revealed a lucent lytic lesion involving the distal phalanx that led to cortical thinning and bone expansion (Figure 2); thus, a tumor-like lesion was considered.
case_images: Creamy material removed from the cyst of the left index finger during the intraoperative curettage.
case_images: fsurg-09-1008358-g003.jpg
case_images: PMC9887288_01_fsurg-09-1008358-g003.jpg
case_images: F3
case_images: After radical debridement, the skin was adjusted and the nail bed was sutured (Figure 3).
case_images: Histopathological examination revealing a wall of stratified squamous epithelium and keratinized material inside a cyst.
case_images: fsurg-09-1008358-g004.jpg
case_images: PMC9887288_01_fsurg-09-1008358-g004.jpg
case_images: F4
case_images: These findings confirmed that the patient had an intraosseous epidermoid cyst (Figure 4), which previously had been misdiagnosed.