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is a significant concern for physicians. Central
( R" y: }0 E' S; Jprecocious puberty (CPP), which is mediated
: [4 @3 n1 u P' t: Rthrough the hypothalamic pituitary gonadal axis, has
$ Q: _2 |- w7 S" Ga higher incidence of organic central nervous system" h9 W% ^; F: [
lesions in boys.1,2 Virilization in boys, as manifested
% C9 n1 L0 {0 Z9 b# N @by enlargement of the penis, development of pubic, u( W" [& H5 s; T
hair, and facial acne without enlargement of testi-
) s$ R. ]9 f5 q. x2 k& U( A+ Ncles, suggests peripheral or pseudopuberty.1-3 We' G D* E& ?2 g' J* _7 [$ P4 y
report a 16-month-old boy who presented with the; ]& ?1 d9 J5 W+ ~+ r
enlargement of the phallus and pubic hair develop-
1 V: N. v: A0 l, d4 vment without testicular enlargement, which was due' X4 F& L$ ]/ x E0 | ]' g
to the unintentional exposure to androgen gel used by
2 D& t# A- J, M6 E% e7 Fthe father. The family initially concealed this infor-
" c+ O2 k3 @# c$ Xmation, resulting in an extensive work-up for this
- d: }* G) g% M; o6 wchild. Given the widespread and easy availability of
0 ?) J F5 I3 u* X3 } e$ gtestosterone gel and cream, we believe this is proba-
, v/ i, S: b4 _& A/ h( cbly more common than the rare case report in the
6 Q2 ]/ Z" N0 b+ n1 bliterature.4
" p9 d- C& A, T0 O* lPatient Report% P0 X9 A4 _6 ~% M& [
A 16-month-old white child was referred to the
% r; d! q# s; Fendocrine clinic by his pediatrician with the concern
/ Y6 C# E0 x% s; E0 m3 n' wof early sexual development. His mother noticed
4 t3 P4 ^+ { D! i: `0 glight colored pubic hair development when he was. e: i5 c" {2 i4 H+ K0 W
From the 1Division of Pediatric Endocrinology, 2University of
. W* m: U% }) N- |5 qSouth Alabama Medical Center, Mobile, Alabama.$ M) C y7 b! T* ^/ e' s8 `
Address correspondence to: Samar K. Bhowmick, MD, FACE,2 u$ G, m) Q3 V+ ^9 g% f
Professor of Pediatrics, University of South Alabama, College of
0 g+ c" M c# N) y! P aMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;, U8 ]1 b5 Y9 ^( N9 `
e-mail: [email protected].
0 _ o, \/ t/ K: c4 pabout 6 to 7 months old, which progressively became) v9 B8 z* T; M1 n% i4 s# _' o
darker. She was also concerned about the enlarge-
; t9 _! Z& h: R( P9 z# @! P0 ^6 Bment of his penis and frequent erections. The child* w$ }! v# P% \1 O7 B
was the product of a full-term normal delivery, with9 ]% J: o, M' I" Q4 Y5 u5 r& q
a birth weight of 7 lb 14 oz, and birth length of/ l/ O9 [6 @& B, v" ^2 g! F& T- x
20 inches. He was breast-fed throughout the first year
/ j: s% J6 Y+ \' G. F3 I& r% ?of life and was still receiving breast milk along with! r% {2 t) U3 d6 q: n) i
solid food. He had no hospitalizations or surgery,
$ F& r4 r7 d6 r/ p7 Qand his psychosocial and psychomotor development* n+ e; t8 Z$ X1 }5 S) I! j
was age appropriate. e& `8 G9 ^- c& K% ?1 B
The family history was remarkable for the father,
3 l; o9 l* O) E+ Wwho was diagnosed with hypothyroidism at age 16,
4 M. T9 m+ X% i. s% L: @which was treated with thyroxine. The father’s
\7 E* n% c$ _" t, h, |6 `1 ]height was 6 feet, and he went through a somewhat4 O5 `* `/ I1 X
early puberty and had stopped growing by age 14.
4 B8 _# t. l) UThe father denied taking any other medication. The' Z5 G8 c% |6 a7 b8 r
child’s mother was in good health. Her menarche8 X2 F9 v% F1 T6 Q
was at 11 years of age, and her height was at 5 feet5 x. ]7 l- r: t0 W6 N$ P6 v
5 inches. There was no other family history of pre-
3 _ _) T0 h% C3 n7 acocious sexual development in the first-degree rela-8 A P8 l/ J! ~
tives. There were no siblings.
& l k- z: n4 v4 n+ }# X2 M* H) [2 ZPhysical Examination$ O" ~3 k& `0 H" a. A9 ^: n
The physical examination revealed a very active,( Q! Q6 J% @6 L9 K& D8 j
playful, and healthy boy. The vital signs documented( @5 U0 S4 A5 t4 c& w$ B4 a
a blood pressure of 85/50 mm Hg, his length was" Y4 g( L @" E9 J7 d
90 cm (>97th percentile), and his weight was 14.4 kg1 G. C3 \' c, T! D) O1 Y0 X b. o/ ^7 I
(also >97th percentile). The observed yearly growth) H& e7 K6 N; T
velocity was 30 cm (12 inches). The examination of
- l1 \* G; t0 {& R5 s# l6 ?the neck revealed no thyroid enlargement.- |# z: G/ d, _- l4 m1 y
The genitourinary examination was remarkable for4 y' Y* u7 z( @! Y
enlargement of the penis, with a stretched length of F, M& N. H! R
8 cm and a width of 2 cm. The glans penis was very well* D# x, E/ Q. u. |' a5 B" z
developed. The pubic hair was Tanner II, mostly around. _$ ]$ G4 H7 |
540
! J* m( u1 g( e5 h! {! R) ~at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from/ R2 V m6 N/ i; r4 g( N! j
the base of the phallus and was dark and curled. The
0 {5 L o, D H! [8 Ztesticular volume was prepubertal at 2 mL each.! c. p9 S; p0 K0 K# i1 O1 {' w
The skin was moist and smooth and somewhat6 ?! F& v5 i, J0 o
oily. No axillary hair was noted. There were no
2 ?: ]+ Z8 q* w" | y$ y+ \' J0 xabnormal skin pigmentations or café-au-lait spots.
- [2 O9 R" e% d: yNeurologic evaluation showed deep tendon reflex 2+
/ `8 \* J% |8 Hbilateral and symmetrical. There was no suggestion
# R: g; C3 J3 q! y. L. A) Q4 Nof papilledema.8 h3 f# a* g1 Z& I
Laboratory Evaluation) T* ^; I4 _+ _) ^& n
The bone age was consistent with 28 months by- |3 v! j" V4 R& Q
using the standard of Greulich and Pyle at a chrono-: Q% \0 }7 p6 U# \0 d
logic age of 16 months (advanced).5 Chromosomal, f; }7 K# R4 D: @
karyotype was 46XY. The thyroid function test
" Q7 H0 o1 |' x% m2 L+ F- Gshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
8 {) [6 Z, V* H* y% F2 t# [% alating hormone level was 1.3 µIU/mL (both normal).
0 W3 ]0 F8 E A Q3 a6 QThe concentrations of serum electrolytes, blood
% n; a! l" F5 R7 `3 ?) Rurea nitrogen, creatinine, and calcium all were
2 v2 Q: o ], Z) k2 {/ f+ V. awithin normal range for his age. The concentration; ?, z$ Q' R* ]; O
of serum 17-hydroxyprogesterone was 16 ng/dL
' P+ {& L" e$ x* l- }( ?: o. G(normal, 3 to 90 ng/dL), androstenedione was 20$ j3 j+ r" F9 j4 Q9 W
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-) S! q Z* @5 q: z' F6 [
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
" ?5 i6 i2 d6 V! l, P2 odesoxycorticosterone was 4.3 ng/dL (normal, 7 to
! ]& g# H1 q$ {1 h! L0 z& h" z X49ng/dL), 11-desoxycortisol (specific compound S)
( d& m: w R$ D; Swas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
- R8 y- X. B" `* u* u4 o) Mtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total* K/ \, g# p# Q9 j- x
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
: j! t( N$ A' Q0 Yand β-human chorionic gonadotropin was less than
/ E# V5 s; H: r0 S' a5 mIU/mL (normal <5 mIU/mL). Serum follicular
( [+ w& p$ R# a: s. Hstimulating hormone and leuteinizing hormone
- l- ~! D* L7 @( o* P) B1 o4 w( dconcentrations were less than 0.05 mIU/mL$ d- B: q! ?* ], l
(prepubertal).% K( ^% M* C! M
The parents were notified about the laboratory8 s$ r7 m. w# h
results and were informed that all of the tests were
& B; u# u G& inormal except the testosterone level was high. The
7 t( @, A9 Z1 ]' v8 bfollow-up visit was arranged within a few weeks to1 ] E2 G# D- G% p
obtain testicular and abdominal sonograms; how-3 R6 Z+ m |% x, a6 _! l6 y! y" ?) p* B
ever, the family did not return for 4 months.+ |& Y; i$ V! t3 b8 F
Physical examination at this time revealed that the5 r$ o# V1 o0 Z* Z
child had grown 2.5 cm in 4 months and had gained7 Y& q6 r" {1 Y
2 kg of weight. Physical examination remained8 c* u* j$ A9 Z9 ~ ^
unchanged. Surprisingly, the pubic hair almost com-
( Q4 a/ N3 `5 v4 L2 r) apletely disappeared except for a few vellous hairs at
. J' p) B E' {/ d; k& _6 O8 nthe base of the phallus. Testicular volume was still 2
& f. l0 n" X( Q5 L' O# ~mL, and the size of the penis remained unchanged.
0 a5 p9 U; ?% j& f8 i( Z9 d% cThe mother also said that the boy was no longer hav-
$ m) D# r8 p: g/ ] ^5 X, {! bing frequent erections.
0 ~* p( p0 ^2 QBoth parents were again questioned about use of
* f6 m. ~) Q, P; U7 f, rany ointment/creams that they may have applied to7 r! J; Q" A+ k$ f, T* d. f- a
the child’s skin. This time the father admitted the
u: V/ T4 e2 r& ^& kTopical Testosterone Exposure / Bhowmick et al 541% k$ z5 ?& }7 X# h
use of testosterone gel twice daily that he was apply-
_7 [! f- g8 @9 E( H+ o( N8 h4 j" Ling over his own shoulders, chest, and back area for. M$ ]- ~8 A. B: P2 ]& W+ e
a year. The father also revealed he was embarrassed9 c1 C Q" v! i, O- Z$ o
to disclose that he was using a testosterone gel pre-( f9 U, j" l) z
scribed by his family physician for decreased libido3 y& J% b0 {& B; ?8 Z. @6 |- @+ B2 i
secondary to depression.# l: P" l7 P3 K4 H- a: a, [
The child slept in the same bed with parents.
: {. \: [- ]1 L8 f' T/ R8 L" WThe father would hug the baby and hold him on his
$ F7 y* }% V- q M7 ^' Vchest for a considerable period of time, causing sig-
5 M/ W# l" f( z' unificant bare skin contact between baby and father.
6 V8 _) G3 F0 i& b: z y6 ZThe father also admitted that after the phone call,
& ]; Q3 f6 x7 m2 B7 c: m& M# |when he learned the testosterone level in the baby
- X8 ~5 ]; @( m7 k( W3 v0 X' N nwas high, he then read the product information5 R4 P/ v5 a8 K+ s
packet and concluded that it was most likely the rea-1 }; ]& F- M2 v V3 k1 @
son for the child’s virilization. At that time, they) F) I) r, z2 H1 c% m
decided to put the baby in a separate bed, and the
5 v! O) v+ g) f- C; rfather was not hugging him with bare skin and had" n5 H+ G4 _+ x. m" x
been using protective clothing. A repeat testosterone
' A. f/ x/ v2 T& W' v/ jtest was ordered, but the family did not go to the
/ P9 M/ Z( V, i' ]8 }# ~1 Y* wlaboratory to obtain the test.
$ [! N3 V! K! s( g: ~$ HDiscussion2 J. U* O, ^( _+ _9 p. w
Precocious puberty in boys is defined as secondary6 Z: j6 u( L0 N# Z0 t
sexual development before 9 years of age.1,4; P( X9 i, A4 b+ ]
Precocious puberty is termed as central (true) when
9 ^3 m- }$ |& x9 Kit is caused by the premature activation of hypo-
. J$ W' |. x' X$ F6 d& r* G( {8 U9 ?! gthalamic pituitary gonadal axis. CPP is more com-. M, m! ^* e2 W" n M! m& W6 A: w
mon in girls than in boys.1,3 Most boys with CPP6 J9 ^. m* ?: v( M* }0 d. m
may have a central nervous system lesion that is
% h P! `( ^" { [& l; k6 w' ^responsible for the early activation of the hypothal-4 C" e/ C9 J# A( z6 {9 L
amic pituitary gonadal axis.1-3 Thus, greater empha- B, N) t3 r3 J0 ?) z- M
sis has been given to neuroradiologic imaging in
8 h+ v1 E! I4 dboys with precocious puberty. In addition to viril-; @7 s- r& r8 F- Z r: B
ization, the clinical hallmark of CPP is the symmet- m4 s" t8 {! U$ t& c% _
rical testicular growth secondary to stimulation by
* _# w1 R3 x) a$ K' V" `1 Zgonadotropins.1,3
5 u; L: C7 h* C, ?% r/ lGonadotropin-independent peripheral preco-
9 \: U g+ E; D# K% ]- bcious puberty in boys also results from inappropriate4 d* P; J$ \9 `! L5 M" X7 b9 i% G
androgenic stimulation from either endogenous or
. z8 @! {7 _" }exogenous sources, nonpituitary gonadotropin stim-
3 Q' E5 q* T/ C! {- a0 P }ulation, and rare activating mutations.3 Virilizing6 m$ l( U, y5 G9 G
congenital adrenal hyperplasia producing excessive; d+ k1 E3 N. z( t+ K; g$ ~# ?
adrenal androgens is a common cause of precocious
! d' c4 a! d6 R1 y9 v* J3 L; P8 }( N3 Ypuberty in boys.3,43 i& B2 w# e$ n" i6 g. x8 D
The most common form of congenital adrenal; m+ b* e$ E4 I x" f: Y
hyperplasia is the 21-hydroxylase enzyme deficiency.
2 w( t2 v2 z# Z) G( @7 D' l' nThe 11-β hydroxylase deficiency may also result in! O+ P# ]* k f4 _
excessive adrenal androgen production, and rarely,4 v! P0 D! @1 m6 c; y* }9 ~1 Z( ?& g6 ]& T
an adrenal tumor may also cause adrenal androgen
# u! x' R" s: T9 u* bexcess.1,3- S& p# @* h1 w7 @0 V
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) w+ w3 ?9 @5 k+ O
542 Clinical Pediatrics / Vol. 46, No. 6, July 20071 ]. n1 f+ i3 |3 s* G9 `; h# M7 C" K
A unique entity of male-limited gonadotropin-. J1 C3 T% r# L4 N
independent precocious puberty, which is also known
, H; L7 q/ k; u7 ~+ Eas testotoxicosis, may cause precocious puberty at a' B! i. k' q! s9 q+ n! ~3 ^
very young age. The physical findings in these boys6 d7 o, U& w' W. r+ i$ w
with this disorder are full pubertal development,/ e" G7 L8 U* O7 B. v5 y/ |
including bilateral testicular growth, similar to boys
, W* y" t6 _' f- o, N9 ]8 Fwith CPP. The gonadotropin levels in this disorder
+ o1 p" s: ~* r/ v4 W( pare suppressed to prepubertal levels and do not show
. Z! ]% V; X* F$ mpubertal response of gonadotropin after gonadotropin-
. l0 |7 z0 D4 o) @ N, W- ureleasing hormone stimulation. This is a sex-linked
/ f) B5 b6 A6 h h3 D/ t0 ?7 eautosomal dominant disorder that affects only
; X, e4 N' o1 L2 _" q4 Jmales; therefore, other male members of the family C4 Z2 h' {7 q, \
may have similar precocious puberty.3
0 g# U& s. \) f! S6 |( \& `- v7 AIn our patient, physical examination was incon-/ ?0 X7 ~+ X. a
sistent with true precocious puberty since his testi-) r, A* B" m, Q; i- J
cles were prepubertal in size. However, testotoxicosis5 T( |3 U# y5 Z, E9 ` z. s
was in the differential diagnosis because his father
- Q0 p% K# W# d5 @1 R3 C* j* cstarted puberty somewhat early, and occasionally,
- k; L# S, n6 r* f7 {. C- atesticular enlargement is not that evident in the
5 F% f- ~& \% r+ Ubeginning of this process.1 In the absence of a neg-* F$ w3 U6 \+ ^9 a4 Y4 T4 @/ I
ative initial history of androgen exposure, our% s' S2 c6 `. u5 W: ]
biggest concern was virilizing adrenal hyperplasia,8 o! a) x6 n& q E N, x
either 21-hydroxylase deficiency or 11-β hydroxylase+ y' C/ ^3 c4 G3 X
deficiency. Those diagnoses were excluded by find-
& a% ~9 U% I) b# V4 Jing the normal level of adrenal steroids.# M4 z' B0 G0 R
The diagnosis of exogenous androgens was strongly( `0 M" O4 c/ i& w
suspected in a follow-up visit after 4 months because
" [7 B4 i# f. S$ dthe physical examination revealed the complete disap-/ C* a4 x8 C" C5 @
pearance of pubic hair, normal growth velocity, and7 F2 |; R$ x9 I& K& I) H3 c9 y
decreased erections. The father admitted using a testos-: i" [8 j* z5 k' c5 \
terone gel, which he concealed at first visit. He was
- E$ @* {$ t9 Q3 q7 ^3 h- I yusing it rather frequently, twice a day. The Physicians’
8 V6 V- a/ r3 j& Q6 GDesk Reference, or package insert of this product, gel or ?1 N! {% B9 i$ x( w k! C
cream, cautions about dermal testosterone transfer to
' |7 R8 f) J" T% j9 {unprotected females through direct skin exposure.3 Q5 u$ c. V- D: o
Serum testosterone level was found to be 2 times the2 z0 b" c: ~9 y: J! ^3 J
baseline value in those females who were exposed to' e! |; t1 I- @% q! n) y
even 15 minutes of direct skin contact with their male6 ]) A, [& e; ]) f
partners.6 However, when a shirt covered the applica-
: t% n2 @* [8 ntion site, this testosterone transfer was prevented.
! H9 w" f5 p+ C# z; `" j! u$ aOur patient’s testosterone level was 60 ng/mL,! C2 o( y* [. _) @& g
which was clearly high. Some studies suggest that+ x. S0 w) R. Z2 X: @0 m- _
dermal conversion of testosterone to dihydrotestos-
% B b. N3 ?' @% Vterone, which is a more potent metabolite, is more
4 M: l) p* `+ Z- {( O1 V& Z) Uactive in young children exposed to testosterone8 Y/ w/ g; A6 T) G
exogenously7; however, we did not measure a dihy-' [6 k* `( ]( g1 {! i
drotestosterone level in our patient. In addition to1 Q' k" K5 I* \' m1 [* v8 b, L
virilization, exposure to exogenous testosterone in% O& S) ]/ Z# p5 ~0 m: }9 H
children results in an increase in growth velocity and4 F/ F: t# H, r4 H6 l# g1 {7 X6 u2 y
advanced bone age, as seen in our patient.
0 L2 c8 s- [, MThe long-term effect of androgen exposure during
4 Q) o9 p0 ?* qearly childhood on pubertal development and final
2 O! @- F( _ Fadult height are not fully known and always remain/ O$ j |" X3 R6 K
a concern. Children treated with short-term testos-
: r" o5 z: w* G+ W3 m2 ? Q2 j+ {1 sterone injection or topical androgen may exhibit some7 F9 q5 T; Q- M% s3 G
acceleration of the skeletal maturation; however, after
; i: U2 X! G. O! hcessation of treatment, the rate of bone maturation
1 K. c" P& _9 @/ i/ ^decelerates and gradually returns to normal.8,94 T- O0 u) _+ z) }+ y, j3 e% H: z& g
There are conflicting reports and controversy
! ?( d% |0 y4 E% _ C% ~9 p- @# Kover the effect of early androgen exposure on adult5 W S8 g) n& s- M0 l, |, l9 d& r1 w
penile length.10,11 Some reports suggest subnormal. W4 A; P, a. T/ a3 H7 p
adult penile length, apparently because of downreg-
$ E H; h" V3 }1 L. v4 G1 y, b/ Q+ [: vulation of androgen receptor number.10,12 However,
8 Y. o8 o* {/ ?Sutherland et al13 did not find a correlation between
; E, ~: m# l zchildhood testosterone exposure and reduced adult- Y! ^9 T& }0 A# O5 ~
penile length in clinical studies.
& w! y U0 @; o2 b `, v* J3 VNonetheless, we do not believe our patient is$ f$ M0 Z3 D& {) X$ R
going to experience any of the untoward effects from
5 e9 T% V( z* a8 V$ [testosterone exposure as mentioned earlier because
: \, w' x! r5 c# |+ g7 U& Othe exposure was not for a prolonged period of time.* g M7 w3 u9 b2 X9 a3 o+ R1 X# b
Although the bone age was advanced at the time of
0 [5 {& P" _3 z1 k7 t+ p) Xdiagnosis, the child had a normal growth velocity at
* S* {& \+ A. a N( Y" ithe follow-up visit. It is hoped that his final adult
# S/ @& Q* I% X/ N9 C) Mheight will not be affected.8 U" J9 \( Z' y9 B9 {6 `9 L
Although rarely reported, the widespread avail-
1 F- \) b z, g0 S9 Fability of androgen products in our society may' }% Y U9 C* O$ a. ~
indeed cause more virilization in male or female4 @" Y( U/ V2 S3 J4 m" Y
children than one would realize. Exposure to andro-
; W) v; L; ]- |0 Rgen products must be considered and specific ques-3 { e& Q4 P' N) }6 Y1 Y" d
tioning about the use of a testosterone product or1 a3 o! ?1 v) [. g1 v# z, U
gel should be asked of the family members during
4 x& P; U2 ?' h0 C! c, @$ Zthe evaluation of any children who present with vir-
# q1 E$ B X3 Z5 H+ w) Iilization or peripheral precocious puberty. The diag-9 S$ ]5 C7 Z' ]$ D4 U$ N* W
nosis can be established by just a few tests and by
. M% \+ Q: k g3 \appropriate history. The inability to obtain such a
i$ I0 E. n7 C9 m2 Vhistory, or failure to ask the specific questions, may* r8 q4 T, }0 \% Z7 }- f8 K
result in extensive, unnecessary, and expensive
$ f# v' ?! L/ ]' Zinvestigation. The primary care physician should be
1 G: O: H' ]0 A+ f% T# Xaware of this fact, because most of these children- J" _8 s( ^0 ]- f
may initially present in their practice. The Physicians’
3 p' k0 U n, |. L$ m4 BDesk Reference and package insert should also put a" H& j; N1 m. i) F
warning about the virilizing effect on a male or+ T! T& N$ D4 Q$ x5 H9 R
female child who might come in contact with some-- F9 t$ i: l0 f1 B
one using any of these products.3 T: U0 s& c- d( ^1 G! R
References
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puberty in children with tumours of the suprasellar pineal
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( O" r7 s; C* u# S6 B* W6 [; ?$ JUnimed Pharmaceutical Inc. Montvale, NJ: Medical
1 J s& L6 z. ~* Q1 h8 s" N6 rEconomics Company, Inc; 2004:3239-3241.
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