**Question:** A patient presents with neck node and B type tympanogram. Diagnosis is

A. Tuberculous lymphadenitis
B. Chronic suppurative otitis media
C. Mastoiditis
D. Acute suppurative otitis media

**Core Concept:**

A neck node is an abnormal enlargement of a lymph node, which is part of the lymphatic system responsible for filtering and fighting infections. The B type tympanogram is a type of audiometric test that measures the pressure-volume relationship of the middle ear. It is commonly used to diagnose middle ear disorders.

**Why the Correct Answer is Right:**

In this case, the correct answer is **D. Acute suppurative otitis media**. This diagnosis is supported by the presence of a neck node, which is a common symptom of a middle ear infection. A B type tympanogram is indicative of fluid accumulation in the middle ear, which is a common feature of acute suppurative otitis media.

**Why Each Wrong Option is Incorrect:**

**A. Tuberculous lymphadenitis:** Although tuberculosis can cause lymphadenopathy, a B type tympanogram is not a typical finding in this condition. Tuberculous lymphadenitis is typically accompanied by other symptoms such as fever, weight loss, and night sweats.

**B. Chronic suppurative otitis media:** This condition typically presents with a prolonged history, chronic ear discharge, and a tympanic membrane perforation. A B type tympanogram is not a common feature of chronic suppurative otitis media.

**C. Mastoiditis:** Mastoiditis is an inflammation of the mastoid air cells, which is usually associated with a history of acute otitis media. A B type tympanogram is not a typical finding in mastoiditis.

**Clinical Pearl:**

The combination of a neck node and a B type tympanogram can help to narrow down the differential diagnosis to acute suppurative otitis media. This clinical presentation should prompt a thorough otoscopic examination, and further diagnostic tests (such as tympanocentesis, culture and sensitivity) to confirm the diagnosis and guide appropriate treatment.

In conclusion, the combination of a neck node and a B type tympanogram points towards acute suppurative otitis media, as it demonstrates the presence of fluid accumulation in the middle ear, which is characteristic of this condition.