“…Lipomas are the most common cause of compression but fibrous bands, often confined to the supinator edge, have also been reported (Goldman et cl , 1969, Bronisch 1971, Bryan et cl , 1971, Comtet et Chambaud 1975, Overgaard Nielsen 1976, DeZanche et ol • 1978. In several cases of posterior interosseous nerve paralysis, pain in the proximal forearm preceding paralysis and/or local tenderness over the nerve has been reported (Guillain and Courtellemont 1905, Woltman and Learmonth 1934, Hobhouse and Held 1936, Weinberger 1939, Richmond 1953, Campbell and Wulf 1954, Kruse 1958, Whiteley and Alpers 1959, Bowen and Stone 1966, Mulholland 1966, Sharrard 1966, Marmor et cl , 1967, Bronisch 1971, loser et cl , 1972, Millender et cl , 1973, Comtet and Chambaud 1975, Benini and DiMartino 1976, Overgaard Nielsen 1976. Personal experience of five cases of posterior interosseous nerve paralysis revealed a lipoma squeezing the nerve from below upwards towards the superficial supinator edge in four and a neurofibroma in one.…”