Semen analysis of a male of an infertile couple shows the absence of spermatozoa but the presence of fructose. The most probable diagnosis is:
**Core Concept**
The presence of fructose in semen indicates that the seminal vesicles are functioning normally, as they are responsible for producing fructose, which is essential for sperm survival and motility. However, the absence of spermatozoa suggests a problem with sperm production or transport.
**Why the Correct Answer is Right**
The absence of spermatozoa in the semen analysis suggests that the issue lies with the testes or the epididymis, rather than the seminal vesicles or prostate. The presence of fructose, however, indicates that the seminal vesicles are intact and functioning properly. This discrepancy points towards a condition known as **Azoospermia with Normal Fructose**, which is often associated with **Klinefelter syndrome** (47,XXY) or **orchitis** (inflammation of the testes).
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not address the discrepancy between the absence of spermatozoa and the presence of fructose in the semen analysis.
* **Option B:** This option is incorrect because it does not take into account the presence of fructose in the semen analysis, which suggests that the seminal vesicles are functioning normally.
* **Option C:** This option is incorrect because it does not provide a clear explanation for the absence of spermatozoa in the semen analysis.
**Clinical Pearl / High-Yield Fact**
In cases of azoospermia with normal fructose, it is essential to investigate the testicular function and anatomy through additional tests, such as testicular biopsy, to determine the underlying cause.
**Correct Answer: D.**