19 results
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 #Table
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 ... not implant #MenstrualCycle
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 ... for clarity) #MenstrualCycle
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 ... Ovarian Cycle #MenstrualCycle
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
LCH: multiple round ... Pattern #Comparison #Table
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
histiocytosis (LCH ... Pattern #Comparison #Table
Causes of Female and Male Infertility - Differential Diagnosis Algorithm
Causes of Female Infertility:
 • Uterus -
Differential Diagnosis Algorithm ... hypogonadism) Low FSH/LH ... problem) High FSH/LH ... Differential #Diagnosis #Algorithm
Menstrual Cycle Physiology: The Hypothalamic-Pituitary-Ovarian Axis
Estrogen, when released:
 • Negatively feeds back on the hypothalamus and
pituitary to Increased LH ... #MenstrualCycle
Primary Amenorrhea Differential Diagnosis Framework

Workup:
 • β-HCG, TSH and PRL
 • Breast Tanner Staging
 • FSH,
Staging • FSH, LH ... obgyn #gynecology #algorithm
Diagnosis of Primary Amenorrhea
A diagnostic approach to primary amenorrhea. (FSH = follicle-stimulating hormone; LH = luteinizing
follicle-stimulating hormone; LH ... #Differential #Algorithm