Infertility in men

Pathophysiology for Infertility in Men  250 words minimum for pathophysiology portion of the assignment.
BRIEFLY explain THE FOLLOWING:
 Differential Diagnosis-   
1. Primary hypogonadism
2.Pituitary adenoma
3. Varicocele
3 diagnostic tests- 
1.Sperm concentration <15 million sperm/mL (oligozoospermia)  2. Sperm Morphology < 4 is normal  3. Seminal fluid parameters results would be poor liquefaction, low ejaculate volume <1.5, decreased seminal pH, presence of fructose, increased leukocyte count.   Treatment/medications-  1. chorionic gonadotropin 2500 international units IM, SUBQ twice weekly for 6 months  2. follirtrophin alfa- 150 units subq 3 times weekly  3. ART (corticosteroids) (IVF) 4. Tamoxifen 20mg orally daily 3-6 months (hormone) 5. Antioxidants  No plagiarism, APA format, with 3 references no more than 5 years old.