aponeurotic fibroma aponeurotic fibroma aponeurotic fibroma (also known as "calcifying aponeurotic fibroma," and "juvenile aponeurotic fibroma") is characterized by a lesion that usually presents as a painless, solitary, deep fibrous nodule, often adherent to tendon, fascia, or periosteum, on the hands and feet. the world health organization, 2020, reclassified aponeurotic fibroma nodules as a specific benign type of the fibroblastic and myofibroblastic tumors.