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Infantile digital fibromatosis (IDF), also termed inclusion body fibromatosis or Reye's tumor, usually occurs as a single, small, asymptomatic, nodule in the dermis on a finger or toe [1] of infants and young children. [2] IMF is a rare disorder with approximately 200 cases reported in the medical literature as of 2021. [3]
Visceral solitary IMF tumors that cause significant tissue injury, are located in vital areas, and/or are life-threatening have been treated by surgical excision or, if surgery is deemed inappropriate, are treated with drugs and/or radiation therapy as indicated in the following section on multiple tumors (with visceral involvement). [6]
Infantile myofibromatosis: solitary tumors commonly occurring in the head and neck regions; multiple tumors occurring in the skin, subcutaneous tissue, muscles, and/or less commonly bones; or, rarely, tumors occurring in an internal organ(s). [4] Aponeurotic fibroma; Infantile digital fibromatosis; Aggressive infantile fibromatosis
The cystic fibroma (fibroma cysticum) has central softening or dilated lymphatic vessels. The myxofibroma (fibroma myxomatodes) is produced by liquefaction of the underlying soft tissue. The cemento-ossifying fibroma is hard and fibrous, most frequently seen in the jaw or mouth, sometimes in connection with a fracture or another type of injury.
Diffuse infantile fibromatosis is a rare condition affecting infants during the first three years of life. This condition is a multicentric infiltration of muscle fibers with fibroblasts resembling those seen in aponeurotic fibromas, presenting as lesions and tumors confined usually to the muscles of the arms, neck, and shoulder area [1]: 607 Diffuse infantile fibromatosis is characterized by ...
Fibromatosis colli (FMC), also termed sternocleidomastoid tumor of infancy, pseudotumor of infancy, [1] and infancy sternocleidomastoid pseudotumor, [2] is an uncommon (incidence: 0.4%–1.3% of live births), congenital tumor in one of the two sternocleidomastoid neck muscles although rare cases have presented with a FMC tumor in both sternocleidomastoid muscles. [3]
Similarities among bland spindle-cell lesions lead to a large number of possibilities in diagnosis, including fibroblastic sarcomas, Gardner fibroma, scar tissue or keloids, superficial fibromatosis, nodular fasciitis, myofibroma, collagenous fibroma, gastrointestinal stromal tumor, solitary fibrous tumor, phyllodes tumor, and other conditions ...
The largest study to date examined 197 cases of FHI. In this study, most individuals presented with a slowly growing, symptomless, subcutaneous mass although rarely these masses were rapidly growing, and/or were tender, painful, warm, and/or were accompanied by skin changes, pigmentation, sweat gland enlargement, and/or increased hair overlaying the tumor.