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clinical diagnosis pathophysiology table ctchest cystic endocrinology radiology radiologyassistant androstenedione aromatase differential estradiol hrct lowattenuation pattern 17bhydroxysteroid 5a aldosterone algorithm
Hypogonadism Differential Diagnosis Algorithm • Low testosterone, Normal or low LH, Normal or low FSH -
Algorithm • Low testosterone ... Normal or low LH ... , Normal LH, Normal ... , Normal LH, Elevated ... , Elevated LH, Elevated
Differential diagnosis of Langerhans cell histiocytosis. Nodular LCH: - Sarcoidosis: perilymphatic distribution. - Metastases: random distribution. Cystic LCH: - LAM: round
Nodular LCH: - Sarcoidosis ... Cystic LCH: - LAM ... #Differential #Comparison
Low Attenuation pattern 1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
LCH: multiple round ... Cystic #Pattern #Comparison
Low Attenuation pattern (2) 1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
histiocytosis (LCH ... Cystic #Pattern #Comparison
Feedback Loop: Prolactin (PRL) • PRL levels exhibit diurnal, menstrual, and age-related variation • TRH has
secretion -> Decr FSH/LH ... females, Decr testosterone
Benign Prostatic Hyperplasia: Pathogenesis and Medications Aging -> Increased Testosterone -> Testosterone metabolized into DHT by type
-> Increased Testosterone ... -> Testosterone ... Conversion of testosterone ... antagonism -> Decr LH ... pituitary -> Decr Testosterone
Glucocorticoid-Induced Osteoporosis: Pathogenesis and Clinical Findings • Negative feedback on hypothalamus/pituitary, Decreasing ACTH -> Decr Sex
Sex Hormones (LH ... , FSH, Testosterone
RIMA dissection during cardiac catheterization RIMA explosion - never inject if the waveform is clearly dampened. Surprisingly
the LIMA/RIMA ostia ... Fluoroscopy #Clinical #LHC
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 Histiocytosis - Langerhans cell histiocytosis (LCH), Erdheim-Chester disease (ECD), Rosai-Dorfman disease (RDD) Comparison of Features by Age,
histiocytosis (LCH ... disease (RDD) Comparison ... Histiocytosis #diagnosis #comparison ... features #management #LCH
Inhibin < Hypothalamus < GnRH ④ Anterior pituitary FSH LH V Sertoli cells V Leydig cells Paracrine e e → #Testosterone
pituitary FSH LH ... Paracrine e e → #Testosterone
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