Fine needle aspiration biopsy diagnosis of dedifferentiated liposarcoma: Cytomorphology and MDM2 amplification by FISH.

Lipomatous mesenchymal tumors constitute the most common type of soft tissue tumors. Well-differentiated liposarcoma (WDLS) can undergo dedifferentiation to a nonlipogenic sarcoma of variable histologic grade. In the recent literature, amplification of the murine double minute 2 (MDM2) oncogene, which has a role in cell cycle control, has been successful in distinguishing WDLS from benign lesions. We present a case of dedifferentiated liposarcoma diagnosed by fine-needle aspiration (FNA), using cytomorphology and ancillary studies (immunocytochemistry and fluorescent in-situ hybridization). An 85-year old female presented to our institution with a firm soft tissue mass of the right buttock. The FNA showed atypical spindle cells, osteoclast-like giant cells and extracellular dense matrix material. The cell block showed cellular groups of highly atypical spindle cells with osteoid and adipose tissue. Fluorescence in situ hybridization (FISH) studies performed on the cell block demonstrated amplification of the MDM2 gene. In addition, the findings were morphologically compatible with the previously resected retroperitoneal dedifferentiated liposarcoma with areas of osteosarcoma. This rare case illustrates the usefulness of FNA and ancillary studies in the diagnosis and subclassification of soft tissue tumors. To the best of our knowledge, this is the first report of MDM2 FISH positivity in a liposarcoma diagnosed by FNA.

IgA nephropathy: Missed diagnosis and renal transplant.

The most common form of chronic glomerulonephritis worldwide is IgA nephropathy (IgAN) where IgA immune complexes are deposited in the glomeruli. About 40%-45% of patients with IgAN present with macroscopic hematuria. Diagnosis occurs through kidney biopsy to visualize IgA deposition in the glomerular mesangial area using immunofluorescence microscopy. We presented a 21-year-old patient referred to the nephrology department for follow-up after renal transplantation. His condition started at the age of nine-year with macroscopic hematuria. At the age of 14 years, he presented with hematuria and serum creatinine of 62 umol/L and was diagnosed with acute cystitis. At the age of 18 years, the patient was admitted with generalized fatigue, muscle cramps, and gross hematuria. Kidney biopsy showed advanced glomerulosclerorosis and IgAN with mesangial hypercellularity. The patient was started on peritoneal dialysis for four months following which he underwent kidney transplant from a nonrelative living donor.