Idiopathic hypertrophy of the first dorsal interosseous and thenar muscles presenting as a tumor in a 12-year-old boy

Myopathic changes in bilateral hypertrophy of the first dorsal interosseus muscle of the hand

“…Literature research of localized hand muscle hypertrophy yielded two cases for which underlying pathology was not reported [2,13]. No biopsies were taken for view (a, b) and non-invasive imaging by ultrasound (c).…”

Congenital Bimelic Hypertrophy of the Hands

“…So far, only 17 cases have been described in the German and English medical literature. The condition varies in severity and has been reported under different names, such as aberrant muscle syndrome and congenital monomelic hypertrophy [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. On MRI and ultrasound, muscle tissue is characterized by normal signal intensity and architecture [ 4 ].…”

“…The only normal values we could find in the literature were from 5 healthy males who had a muscle belly width of 9.6 ± 0.5 mm on ultrasound (mean of radial and ulnar muscle proportion). There are no normal values known for the abductor pollicis muscle [ 1 , 2 ]. The right forearm axial diameter measured at maximum (10 cm from the elbow) 54.75 × 53.12 mm, compared to 50.04 × 50.58 mm for the left arm.…”

Botulinum toxin therapy for isolated first dorsal interosseous muscle pain and hypertrophy: A case report

“…1 , 2 , 3 , 4 , 5 However, isolated hypertrophy of a particular muscle, such as the first dorsal interosseous (FDI) muscle, is unusual. 6 , 7 , 8 , 9 …”

“…Skeletal muscle hypertrophy can result from various factors, including congenital conditions, strength training, overuse, neuromuscular disorders, compensatory responses, or systemic diseases 1–5 . However, isolated hypertrophy of a particular muscle, such as the first dorsal interosseous (FDI) muscle, is unusual 6–9 …”