Acquired C1 esterase inhibitor deficiency
Encyclopedia
Acquired C1 esterase inhibitor deficiency presents with symptoms indistinguishable from hereditary angioedema
Hereditary angioedema
Hereditary angioedema presents in the second to fourth decade, and is characterized by local swelling in subcutaneous tissues....

, but generally with onset after the fourth decade of life.

C4
C4
C4, C04, C.IV or C-4 may refer to:* C-4 , a type of plastic explosive* Hafdasa C-4, an Argentine submachine gunIn biology:* C4 carbon fixation, a pathway for carbon fixation in photosynthesis...

 levels are low and C3
C3
-Biology:* C3 carbon fixation in plants* C3-convertase, an enzyme* Apolipoprotein C3, a human very low density lipoprotein* ATC code C03 Diuretics, a subgroup of the Anatomical Therapeutic Chemical Classification System...

levels are normal.
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