Parathyroid adenoma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

There is no established system for the classification of [disease name].

OR

[Disease name] may be classified according to [classification method] into [number] subtypes/groups: [group1], [group2], [group3], and [group4].

OR

[Disease name] may be classified into [large number > 6] subtypes based on [classification method 1], [classification method 2], and [classification method 3]. [Disease name] may be classified into several subtypes based on [classification method 1], [classification method 2], and [classification method 3].

OR

Based on the duration of symptoms, [disease name] may be classified as either acute or chronic.

OR

If the staging system involves specific and characteristic findings and features: According to the [staging system + reference], there are [number] stages of [malignancy name] based on the [finding1], [finding2], and [finding3]. Each stage is assigned a [letter/number1] and a [letter/number2] that designate the [feature1] and [feature2].

OR

The staging of [malignancy name] is based on the [staging system].

OR

There is no established system for the staging of [malignancy name].

Classification

Parathyroid may be classified according to location into 7 subtypes:

Type	Location
Type A	Adherent to the posterior thyroid parenchyma Expected location of a normal gland Almost attached Almost intracapsular
Type B	Back behind the thyroid parenchyma Exophytic to the thyroid parenchyma Lies in the tracheoesophageal groove B+ gland: An undescended gland high in the neck near the carotid bifurcation or mandible
Type C	Could be mistaken for the esophagus when palpated Caudal to the thyroid parenchyma, in the tracheoesophageal groove More inferior than a type B gland on lateral views Situated at the level of the inferior pole of the thyroid or inferior to the inferior pole of the thyroid (closer to the clavicle)
Type D	Dissection is difficult as the gland is dangerously close to the recurrent laryngeal nerve
Type E	The most externally located gland Easy to resect
Type F	Fallen into the thyrothymic ligament May be referred as "ectopic" Can be usually retrieved with delivery of the superior portion of the thymus
Type G	Got caught in thyroid tissue Gated into the thyroid parenchyma A true intra intrathyroidal gland is rare