The acute ischemic damage of a nerve can give a pattern of conduction block in the electroneurographic study as in the RMN of the presented case. This phenomenon is referred as "pseudo-conduction block", since it is transient and evolves towards a definite pattern of axonal neuropathy. When a vasculitic neuropathy is suspected, repeated neurophysiologic studies are necessary in order to ensure a proper (appropriate) characterization of the lesional patterns.

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RESUMENEl condroblastoma es un tumor benigno de origen cartilaginoso que representa menos del 1% de todos los tumores óseos primarios. Se localiza típicamente en la epífisis de los huesos largos. Un 10% de los condroblastomas afectan a huesos del pie y de la mano. El asiento de esta lesión en el carpo es extraordinariamente raro.Se presenta un caso de condroblastoma del escafoides del carpo que fue tratado mediante curetaje de la lesión y relleno con injerto óseo autólogo de cresta iliaca.Palabras clave. Condroblastoma. Escafoides. ABSTRACTA chondroblastoma is a benign tumour of cartilaginous origin which represents less than 1% of all primary osseous tumours. It is typically localised in the epiphysis of the long bones. Some 10% of chondroblastomas affect the bones of the foot and the hand. It is extremely rare for the seat of this lesion to be in the carpal bones.We present a case of chondroblastoma of the carpal scaphoids that was treated through curretage of the lesion and filling with autologous osseous graft from the iliac crest.Palabras clave. Chondroblastoma. Scaphoids.