A 31-year-old male with a plasmacytoid dendritic blast cell neoplasm.

Plasmacytoid blast dendritic cell neoplasm is a rare subtype of acute leukaemia that represents less than 1% of haematologic neoplasms. It is characterised by skin involvement and leukaemic dissemination in the rest of the body. The immunophenotype is represented by the expression of CD4, CD56 and CD123.

[Tibial brown tumor as a presentation of primary hyperparathyroidism].

Cystic fibrous osteitis is a complication of a very evolved hyperparathyroidism. Because the determination of calcium, parathyroid hormone and vitamin D have become routine studies, this bone complication is uncommon in western countries. However, it should be considered in the differential diagnosis of hypercalcemia and lytic bone lesions.

[Emphysematous cystitis in an 87 year old man].

Emphysematous cystitis is a complicated form of urinary tract infection, characterized by the presence of air inside the wall and in the light of the bladder, affecting more diabetics, elderly and immunosuppressed. The microorganisms that most frequently cause this entity are Escherichia coli and Klebsiella pneumoniae. Its treatment is based on broad-spectrum antibiotics, bladder catheterization and partial or total cystectomy in severe cases.