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ctchest radiology radiologyassistant pathophysiology langerhanscellhistiocytosis diagnosis histiocytosis cystic menstrualcycle ovariancycle comparison algorithm differential langerhans pituitary table cavitary cxr hrct late
Differential diagnosis of Langerhans cell histiocytosis. Nodular LCH: - Sarcoidosis: perilymphatic distribution. - Metastases: random distribution. Cystic LCH: - LAM: round
Nodular LCH: - Sarcoidosis ... Cystic LCH: - LAM ... central dot. - LIP #Clinical
Menstrual Cycle Physiology: Ovarian Cycle – Brief Overview LH and FSH are required for follicular development and
Brief Overview LH ... granulosa cells - LH ... following ovulation -> LH ... -> Inhibit FSH/LH ... #menstruation #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained Around Day 14, estrogen exerts sudden +++ positive feedback
understood) -> surge in LH ... production and release LH ... 36 hours after LH ... pathophysiology #Ovulation #endocrinology
Hypogonadism Differential Diagnosis Algorithm • Low testosterone, Normal or low LH, Normal or low FSH -
Normal or low LH ... testosterone, Normal LH ... testosterone, Normal LH ... testosterone, Elevated LH ... #Testosterone #endocrinology
RIMA dissection during cardiac catheterization RIMA explosion - never inject if the waveform is clearly dampened. Surprisingly
the LIMA/RIMA ostia ... #Fluoroscopy #Clinical ... #LHC #CathLab
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 Low Attenuation pattern 1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
LCH: multiple round ... #Clinical #Radiology
Menstrual Cycle Physiology: Ovarian Cycle – Luteal Phase Explained • The LH surge can be thought
Explained • The LH ... Day 14 surge in LH ... GnRH, FSH, and LH ... • Decreased LH ... #LutealPhase #endocrinology
Low Attenuation pattern (2) 1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
histiocytosis (LCH ... #Clinical #Radiology
Cushing Syndrome Testing Algorithm INDICATIONS FOR TESTING: • Suspected Cushing syndrome (central obesity, muscle weakness, refractory hypertension) Testing:
Urine Free by LC-MS ... diagnosis #algorithm #endocrinology
Feedback Loop: Prolactin (PRL) • PRL levels exhibit diurnal, menstrual, and age-related variation • TRH has
secretion -> Decr FSH/LH ... #FeedbackLoop #endocrinology
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