A 10-year-old boy presents with nasal obstruction and intermittent profuse epistaxis. He has a firm pinkish mass in the nasopharynx. All of the following investigations are done in this case except:
**Core Concept**
The case description suggests a possible diagnosis of juvenile nasopharyngeal angiofibroma (JNA), a benign but locally aggressive vascular tumor that predominantly affects adolescent males. JNA typically presents with nasal obstruction, epistaxis, and a firm, pinkish mass in the nasopharynx.
**Why the Correct Answer is Right**
The correct answer is likely related to the diagnostic approach for JNA. Imaging studies, such as computed tomography (CT) and magnetic resonance imaging (MRI), are essential for assessing the extent of the tumor and its relationship with surrounding structures. Angiography may also be performed to evaluate the tumor's vascular supply and to plan embolization or surgical resection. However, the specific investigation that is not typically performed in this case is likely to be a blood test.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option could be a correct investigation, such as a CT scan or MRI, which are commonly used to evaluate the extent of the tumor.
* **Option B:** Angiography is a relevant investigation for JNA, as it helps to evaluate the tumor's vascular supply and plan embolization or surgical resection.
* **Option C:** This option could be a correct investigation, such as a complete blood count (CBC) or coagulation studies, which may be performed to evaluate for any underlying bleeding disorders.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that JNA is a highly vascular tumor, and its management often requires a multidisciplinary approach involving otolaryngology, radiology, and interventional radiology.
**Correct Answer:** D.