[Clinical presentation of a dorsal epidural arachnoid cyst after an epidural anesthesia].

Background: Arachnoid cysts are dural diverticula with liquid content similar to cerebrospinal fluid, with 1% occurring in the spinal cord. They locate mainly in the dorsal region of the thoracic spine, and are unusual causes of spinal cord compression.

Clinical Case: The case is presented of a previously healthy 15-year-old boy, with a 20-month history of spastic paraparesis that started apparently after epidural block for ankle osteosynthesis.

[Arthritis: an unusual and anticipatory clinical presentation of pediatric acute lymphoblastic leukemia. A case report].

Background: Acute lymphoblastic leukemia initially shows osteoarticular manifestations. However, it is rare that it shows juvenile idiopathic arthritis (JIA) symptoms.

Clinical Case: A child with acute lymphoblastic leukemia initially misdiagnosed with malignant neoplasia and septic arthritis, and later on with juvenile idiopathic arthritis.

Pseudorheumatoid dysplasia. A rare genetic disorder simulating juvenile idiopathic arthritis.

We present the case of a teenage patient with progressive pseudorheumatoid dysplasia, an autosomal recessive disorder that may be initially misdiagnosed as juvenile idiopathic arthritis.