C1 Esterase Inhibitor Deficiency: A Case Report and Review of Literature
term 'angioedema' describes a circumscribed edema of the skin, gastrointestinal
(GI) tract or respiratory tract. Classic hereditary angioedema (HAE) can be associated
with quantitative (type I) or qualitative (type II) deficiency of C1 esterase inhibitor
(C1-INH), which is caused by mutations in the C1-INH gene. In classic HAE, abdominal attacks
are mostly characterized by pain, vomiting and diarrhea, but rarely occur in the
absence of other clinical features. Here we describe a case of angioedema of the
bowel, a rare presentation, occurring in an elderly with C1-INH deficiency.
50-year-old man presented with an 8-month history of recurrent episodic severe abdominal
pain, associated with loose bowel. Each episode lasted for a couple of days and
would resolve spontaneously. The patient's medical history included hypertension,
transurethral resection of the prostate for benign prostatic hyperplasia, No h/s/o
any allergies. On extensive evaluation, which included several EGD’s and colonoscopies
over the span of 8 months, with normal endoscopic findings. Computed tomography
with contrast during episode of attack shows extensive concentric colonic and small
bowel thickening with trace ascites. Most of the other workup was grossly within
normal limits other than Levels of C4 (< 9 mg/dL; reference range 15 to 50 mg/dL),
CH50 (< 13 U/mL; reference range 29 to 45 U/ml) and C1 inhibitor (< 4 mg/dL;
reference range 14 to 30 mg/dL) were all low, supporting a diagnosis of acquired
angioedema (AAE) with isolated bowel involvement. Said patient's symptoms improved
with antihistamine and supportive treatment, with danazol treatment planned on an
outpatient basis for prophylaxis after discharge. Patient didn’t report any attack
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