A 50 year old male presented with signs and symptoms of restrictive hea disease. A right ventricular endo-myocardial biospy revealed deposition of extracellular eosionophilic hyaline material. On transmission electron microscopy, this material is most likely to reveal the presence of:: (A) Non branching filaments of indefinitive length, (B) Cross banded fibres with 67 m periodicity, (C) Weibel-Palade bodies, (D) Concentric whorls of lamellar structures
Answer is A. Concentric whorls of lamellar structures