Key result
Extraskeletal Ewing's sarcoma can present atypically in the thumb, requiring histopathology to exclude benign lesions.
Why the study?
Extraskeletal Ewing's sarcoma is a rare soft tissue tumor that uncommonly occurs in the thumb, underscoring the diagnostic challenge and the role of histopathology.
Highlights the rarity of extraskeletal Ewing's sarcoma in the thumb and the importance of histopathology for accurate diagnosis.
Atypical thumb lesions warrant histopathology to exclude rare sarcoma; extends known primary sites of extraskeletal Ewing sarcoma.
Extraskeletal Ewing’s sarcoma (EES) is a rare tumor arising from the soft tissue. It commonly involves the paravertebral region followed by lower extremities, chest wall, retroperitoneum, pelvis and hip, and upper extremities. We report a case of EES located in the distal phalanx of the right thumb in a female patient aged 17 years. Considering the infrequency of extraskeletal type and site, as in this case, we highlight the rarity of EES of the thumb as well as the importance of histopathology in diagnosing these rare cases to provide proper treatment to the patient.
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Naaz et al. (2026) studied this question. Primary extraskeletal Ewing's sarcoma can present atypically in the distal phalanx of the thumb, emphasizing the necessity of histopathology to differentiate it from benign lesions.
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