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Causes of Primary and Secondary Amenorrhea - Differential Diagnosis Algorithm
Primary Amenorrhea - No onset of menarche
of Primary and Secondary ... by age 16 with secondary ... age 14 without secondary ... Central - Pituitary Secondary ... Causes #OBGyn #Gynecology
Hair Loss (Alopecia) - General (Diffuse and Focal) Differential Diagnosis Algorithm

DIFFUSE
Scarring - Irreversible-biopsy required
 • Lupus
decalvans - Secondary ... areata • Secondary ... Diffuse #Focal #HairLoss
Hyperuricemia - Differential Diagnosis Algorithm
Primary - Over-production
     • Increased turnover of nucleotides
Primary
• Starvation Secondary ... High purine diet Secondary ... Diagnosis #Algorithm #endocrinology
Causes of Secondary Amenorrhea - Differential Diagnosis Algorithm
Absence of menses for more than 3 cycles or
Causes of Secondary ... Cervical stenosis #Secondary ... Causes #OBGyn #Gynecology
Causes of Primary Amenorrhea - Differential Diagnosis Algorithm
No onset of menarche by age 16 with secondary
by age 16 with secondary ... age 14 without secondary ... Causes #OBGyn #Gynecology
Hypercalcemia - Differential Diagnosis Algorithm
Primary Hyperparathyroidism
 • Adenoma
 • Hyperplasia
 • MEN 1 and 2A
Tertiary Hyperparathyroidism
long-standing secondary ... Diagnosis #Algorithm #Endocrinology
Hypocalcemia - Differential Diagnosis Algorithm - Low and High Phosphate
LOW PHOSPHATE
 - Low/NormaI PTH
High PTH • Secondary ... Algorithm #Phosphate #endocrinology
Gynecomastia - Differential Diagnosis Algorithm
No Testicular Mass on Ultrasound
 • Adrenal Neoplasm
 • Increased Extraglomerular Aromatase
• Non-Tumor Secondary ... Algorithm #causes #endocrinology
Focal / Localized Hair Loss (Alopecia) - Differential Diagnosis Algorithm

Scarring - Irreversible-biopsy required
 - Infectious
decalvans - Secondary ... areata • Secondary ... syphilis #HairLoss