Publication date: Available online 11 November 2017
Source:Human Pathology
Author(s): Yessica Garcia, A. Bernard Collins, James R. Stone
In the past, the diagnosis and typing of amyloidosis often required an invasive biopsy of an internal organ, such as the heart or kidneys. Abdominal fat pad excisional biopsy (FPEB) offers a less invasive approach, but the sensitivity of this technique has been unclear. To determine the sensitivity of FPEB for immunoglobulin light chain (AL) and transthyretin (ATTR) amyloidosis, we performed a retrospective clinicopathologic analysis of 97 patients who had undergone FPEB, of which 16 were positive for amyloid. The most significant pretest feature predicting a positive FPEB was a serum free light chain kappa/lambda ratio less than 0.5, and in this group of patients the probability of a positive biopsy was dependent on the size of the biopsy (P=.004). In FPEBs, the amyloid was present in multiple distinct patterns: pericellular, septal, medium sized vessel, small vessel, and nodular. For patients with AL amyloidosis for which direct typing was attempted using the FPEB tissue, the amyloid was successfully typed in the FPEB in 90% of cases. The overall sensitivity of FPEB was 79% for AL amyloidosis and 12% for ATTR amyloidosis (P=.0003). In patients with AL amyloidosis, the sensitivity of FPEB was dependent on biopsy size, with small biopsies (≤700mm3) having a sensitivity of ~50%, and large biopsies (>700mm3) having a sensitivity of ~100%. This study demonstrates that FPEB has high sensitivity for AL amyloidosis, and can be routinely used to type the amyloid. However, FPEB has low sensitivity for ATTR amyloidosis in our patient population.
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Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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! # Ola via Alexandros G.Sfakianakis on Inoreader
Η λίστα ιστολογίων μου
Τετάρτη 15 Νοεμβρίου 2017
Abdominal Fat Pad Excisional Biopsy for the Diagnosis and Typing of Systemic Amyloidosis
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