A Case of Neuroma Cutis Simulating Isolated Plantar Collagenoma / 대한피부과학회지

The true neuromas represent a specific entity in the range of benign nerve sheath tumor. The lesions exist in the skin and mucous membrane. Of these, palisaded encapsulated neuroma(PEN) is a solitary tumor measuring less than 0.5 cm and usually locates on the face. A 5-year-old boy presented with an isolated 3.0X3.0X0.7cm sized, soft collagenoma-like mass on the plantar area of left foot. It had developed for about 4 years. The histologic features demonstrated PEN-like encapsulated bulbous expansions in the dermis. This clinical manifestation of neuroma is considered a rarity.

A Case of Isolated Plantar Collagenoma

Isolated plantar collagenoma with a cerebriform appearance is a hamartomatous lesion consisting of proliferation of normal collagen tissue and has been reported with other systemic alterations described as Proteus syndrome. We report herein a rare case of isolated collagenoma located on the plantar surface with macrodactyly of the 3rd and 4th toes occurring on the right foot, which is considered as an incomplete form of Proteus syndrome. A 36-year-old male with normal intellectual and physical development visited with a pedunculated, soft, dome-shaped tumor and multiple, grouped, slightly elevated nodules on the right plantar region and hypertrophy of the 3rd and 4th toes of the right foot. The lesions appeared during early childhood and have been growing steadily since then. Total excision of the plantar mass with skin grafting and debulking of the 3rd toe and amputation of the 4th toe were done.