Abstract：
Nodular fasciitis is a benign soft tissue pseudotumour typically occurring in the upper extremities, head and neck, thigh and trunk. It is most commonly seen in subcutaneous locations but also can be present in intramuscular and intermuscular (fascial) locations. Its occurrence in the hand is rare, and while it can occur in close proximity to tendons, its presentation as an intra-tendinous mass has not been previously described. We present a unique and rare case of nodular fasciitis arising within the flexor digitorum profundus (FDP) tendon of the hand in a 16-year-old female. The patient presented with a painful swelling in the volar aspect of the base of her left middle finger, with progressive flexion deformity of the finger. Ultrasound and magnetic resonance imaging revealed a mass within the FDP tendon of the middle finger. An ultrasound-guided biopsy revealed a diagnosis of nodular fasciitis. Given the self-limiting nature of the condition, she was managed conservatively with close clinical and imaging follow-up. This case highlights the importance of considering nodular fasciitis in the differential diagnosis of an intra-tendinous lesion in the hand, even though it is a rare occurrence in this location. The clinical presentation, diagnostic workup, and management of this unique case are discussed, emphasising the potential for its misdiagnosis as a malignancy which can have important implications in management.
摘要：
结节性筋膜炎是一种良性软组织假瘤，通常发生在上肢。头部和颈部,大腿和躯干.它最常见于皮下位置,但也可存在于肌内和肌间(筋膜)位置。它在手中的发生是罕见的，虽然它可以发生在肌腱附近，以前没有描述过它作为肌腱内肿块的表现。我们在一名16岁的女性中，在手部的指深屈肌（FDP）肌腱内出现了一种独特且罕见的结节性筋膜炎。患者左中指根部掌侧出现疼痛性肿胀，手指进行性屈曲畸形。超声和磁共振成像显示中指FDP肌腱内有肿块。超声引导活检显示诊断为结节性筋膜炎。鉴于条件的自我限制性质，在密切的临床和影像学随访中对她进行了保守治疗.该病例强调了在手部肌腱内病变的鉴别诊断中考虑结节性筋膜炎的重要性。尽管在这个地方很少发生。临床表现，诊断检查,并讨论了这个独特案例的管理，强调其误诊为恶性肿瘤的可能性，这可能在管理中具有重要意义。
