A Pediatric Patient with Thumb Hypertrophy and Schwannoma: Possibility of a Congenital Condition

A 15-year-old male patient presented with an enlargement of his right thumb. The thumb had an atypical morphology characterized by a hypertrophic tip and a concave pulp. His parents had noticed this deformity since he was an infant. As the patient grew older, he began to feel tenderness in the hypertrophic region. We thought that this condition could be congenital and attributed the origin of the tenderness to decreased fat tissue in the pulp. We planned surgery to excise the skin on the concave part and augment the bulk there with a flap from the distal hypertrophic part. Intraoperatively, a solid subcutaneous tumor was found in the distal hypertrophic region. Pathological examination confirmed that the tumor was a schwannoma. Postoperatively, the tenderness resolved and the appearance of the thumb improved. This case is very atypical; information on this condition is lacking in the literature.