PMC9887288_01
Preoperative view showing the swelling, redness, and tenderness on the eponychium of the left index finger.
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F1
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).
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.
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F2
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.
Creamy material removed from the cyst of the left index finger during the intraoperative curettage.
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F3
After radical debridement, the skin was adjusted and the nail bed was sutured (Figure 3).
Histopathological examination revealing a wall of stratified squamous epithelium and keratinized material inside a cyst.
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F4
These findings confirmed that the patient had an intraosseous epidermoid cyst (Figure 4), which previously had been misdiagnosed.